Build Your Own with an 80 Percent Lower Receiver Kit

Unlock the final frontier of firearm craftsmanship with an 80% lower receiver kit, the ultimate blank canvas for a custom-built pistol or rifle. This unregulated block of metal or polymer puts total control in your hands, allowing you to mill, drill, and complete a legally un-serialized frame at home. It’s the perfect challenge for DIY enthusiasts ready to forge a truly personal weapon.

Understanding the Blank Lower Receiver: A Complete Overview

A blank lower receiver is the foundational component of an AR-15 style firearm, serving as the serialized, legally regulated part that houses the trigger group, magazine well, and buffer tube attachment point. As an uncompleted piece, it lacks fire control components and does not function as a weapon, making its purchase subject to federal regulations for transfer only through licensed dealers. Understanding its role is critical for builders assembling a firearm from scratch, as it determines compatibility with uppers and calibers. For lower receiver compliance, buyers must ensure age and background check requirements are met, while AR-15 build best practices emphasize verifying the receiver’s material—typically 7075-T6 aluminum—to guarantee durability and precise fitment. This overview clarifies the legal and mechanical significance of the blank lower receiver as the central chassis in modular firearm construction.

What Defines an Unfinished 80 Percent Component

The blank lower receiver is the foundational serialized component of an AR-15 style firearm, legally classified as the firearm itself. Understanding its role is critical for builders and enthusiasts. This core part houses the trigger group, magazine well, and buffer tube, connecting the upper receiver and stock. A key distinction is between a stripped lower receiver—which has no internal parts—and an 80% lower, an unfinished block requiring machining. Key considerations when selecting one include material, such as 7075-T6 aluminum for durability versus polymer for lightweight builds, and compatibility with your chosen upper receiver.

• Always check local laws on purchasing and finishing lower receivers.
• Prioritize Mil-Spec dimensions to ensure reliable fitment.
• Inspect the trigger pocket and safety selector detent holes for proper machining.

Key Legal Distinctions from Completed Receivers

A blank lower receiver is essentially the foundation of an AR-style firearm—the part that houses the trigger group and magazine well, but without any serial number or completed fire-control holes. Think of it as a paperweight with potential; you can turn it into a finished lower using basic tools, but until then, it’s just aluminum or polymer. The legal status of a blank lower receiver depends entirely on whether it’s considered “readily convertible” to a firearm. Most hobbyists buy them for custom builds because they offer flexibility, but you must follow local laws. Always check your state regulations before ordering one. Here’s why people choose blanks:

• Cost less than completed lowers
• Allow full personalization
• Teach you how the action works

How These Kits Differ from Standard Builds

A blank lower receiver is the foundational component of an AR-15-style firearm, essentially the unfinished housing that requires machining before it can function. Understanding the legal and technical aspects of a blank lower receiver is crucial for builders. Unlike a completed lower, it lacks critical fire-control cavities, making it a non-firearm under certain regulations, which appeals to DIY enthusiasts. However, federal restrictions vary, so always verify local laws before purchasing. This single piece of metal holds the blueprint for an entire rifle’s potential. The build process typically involves:

• Drilling trigger and hammer pin holes
• Milling the magazine well
• Finishing the receiver for assembly

Essential Tools and Setup for Your First Build

Assembling your first PC is an electrifying rite of passage, beginning with the right gear. You’ll need a magnetic screwdriver set to prevent dropped fasteners from shorting the motherboard, alongside an anti-static wrist strap for grounding. A clean, spacious table with bright lighting is non-negotiable. For thermal paste application, a pea-sized dot is standard, but some builders prefer a credit card for spreading.

A cluttered workspace is the number one enemy of a smooth first build—organization directly prevents damaging delicate pins or losing tiny screws.

Finally, have a USB drive pre-loaded with your operating system and the latest chipset drivers. This methodical setup transforms a daunting task into a focused, rewarding challenge, ensuring your new machine powers on without a hitch.

Minimum Required Equipment for Milling and Drilling

For your first PC build, start with a reliable Phillips-head screwdriver and an anti-static wrist strap to avoid component damage. Essential tools for PC building also include a magnetic tray for screws, decent cable ties, and a modular power supply to reduce clutter. Before assembly, clear a large, well-lit workspace and lay out all parts: motherboard, CPU, RAM, GPU, storage, and PSU. First, mount the CPU and RAM onto the motherboard outside the case—this makes fan and cooler installation far easier. Secure the motherboard inside the case using standoffs, then connect the PSU cables before adding the GPU. Always consult your manuals for specific torque and slotting instructions, and test the build on a cardboard box before final install to avoid returns.

Choosing the Right Jig for Precision Work

Starting your first PC build requires a clean workspace and the right tools. The absolute essentials include a magnetic Phillips-head screwdriver to prevent dropped screws, a pair of anti-static tweezers for jumper pins, and zip ties for cable management. A magnetic parts tray keeps small components secure, while a headlamp ensures you see tight motherboard corners. Before assembly, verify your power supply is modular to reduce clutter and confirm your case has standoffs pre-installed.

Spend 80% of your time on cable routing; a tidy interior improves airflow and makes troubleshooting far easier.

Remember, a stable build begins with grounding yourself on the case frame regularly to avoid static discharge. Avoid working on carpet, and always mount your CPU cooler before installing the motherboard into the case for easier bracket access. A simple checklist—screwdriver, thermal paste, and an anti-static wrist strap—will save hours of frustration.

Workstation Safety and Preparation Tips

Before starting your first build, gathering the right gear is half the battle. You’ll need a magnetic Phillips-head screwdriver kit to avoid dropping tiny bolts into the case. An anti-static wrist strap is critical for grounding yourself against damaging sensitive components. Your workspace should be clear, well-lit, and non-carpeted. A clean, flat table at waist height prevents back strain and accidental spills. Use a tray or magnetic mat to organize screws—sizes differ for the motherboard, PSU, and storage. A pair of small, sharp tweezers or needle-nose pliers helps reach tight jumper cables. Finally, keep a flashlight handy to spot stubborn header pins and a zip-tie kit for cable management. With these tools, assembly runs smoothly and frustration stays low.

Step-by-Step Guide to Finishing the Receiver

The key to a satisfying receiver build is patience, starting with a thorough inspection of your frame for any burrs or sharp edges. After a careful deburring, the journey of precision assembly begins, cleaning all channels and aligning the trigger group components with a steady hand. Each pin should be seated with a deliberate, gentle push, ensuring the hammer springs sit perfectly. You then navigate the intricate tangles of the safety and bolt catch, feeling the small, satisfying clicks as everything locks into place. Finally, with the upper receiver mated, you drive the rear takedown pin home, hearing that solid, metallic thud. This last step confirms your craftsmanship with firearms has birthed a smooth, reliable action from a pile of parts.

Marking and Positioning the Fire Control Pocket

To finish the receiver, first ensure the lower receiver is secured in a vise with a block, then install the bolt catch and magazine catch assembly from the left side. Next, insert the trigger group, hammer, and selector as a unit, pinning them securely. After this, tap in the bolt catch plunger and spring, followed by the pivot and takedown pin assemblies. Finally, attach the pistol grip and stock buffer tube. <AR-15 lower receiver assembly> demands precision: use proper roll pin punches to avoid marring the finish, and never force components. This method guarantees a reliable, functional firearm built by your own hands.

Using a Drill Press or Router for Material Removal

Mastering the step-by-step guide to finishing the receiver starts with a thorough inspection. First, remove all small parts and clean every surface, removing any burrs or sharp edges. Next, apply a metal primer to prevent rust, ensuring full coverage in tight corners. After drying, sand lightly with fine-grit paper for adhesion. Then, spray your chosen finish—ceracoate for durability or anodizing for a factory look—in thin, even coats. A flawless finish relies on patience between each drying stage. Finally, reassemble the components, checking for smooth action. Test function with snap caps before your range session.

Deburring, Polishing, and Final Inspection

To finish the receiver, first ensure your lower receiver is free from burrs and debris. Proper receiver prep is crucial for flawless function. Next, carefully install the trigger group and hammer, securing them with the provided pins. Then, slide in the bolt catch and its spring, followed by the magazine catch assembly. After that, gently insert the selector switch, ensuring it clicks into place. *Each component must seat perfectly for reliable cycling.* Finally, test the safety selector and charging handle movement before assembly. A smooth, precise build rewards your patience with dead-sure reliability.

Selecting the Right Kit for Your Needs

Selecting the right kit for your needs begins with a brutal audit of your actual usage, not just your desires. Prioritize durability and task-specific versatility above all else, as a single high-quality tool outperforms a drawer full of cheap alternatives. Every component must justify its weight and space in your workflow.

A tool that never fails is worth ten that occasionally shine; reliability is the only true economy.

By investing in a cohesive system where every part serves a distinct, necessary function, you eliminate redundancy and frustration. The right kit transforms potential into performance, turning every project from a chore into a statement of capability. Choose with conviction, and your gear will never hold you back.

Aluminum Versus Polymer: Material Tradeoffs

Choosing the right kit begins with a clear-eyed assessment of your goals, whether you’re gearing up for a weekend project or a professional shoot. Your essential gear selection hinges on matching tool capabilities to your primary tasks—don’t let flashy features distract from core needs. Start by evaluating the environment: a compact, weather-sealed kit works best for outdoor creators, while studio work demands higher power and customization. Build your foundation around a versatile main tool, then layer in specialized accessories like quality lenses or precision scalpels. Prioritize ergonomics too; a poorly balanced kit can slow you down and cause fatigue. Avoid the trap of buying everything at once—focus on acquiring pieces that solve immediate problems or unlock new creative potential. As your skills evolve, regularly audit your collection, swapping out underperformers for gear that sharpens your efficiency and output quality.

Compatibility with Mil-Spec and Custom Parts

Choosing the right kit isn’t about grabbing the shiniest box; it’s about listening to your own workflow. I once watched a friend overbuy a massive camera rig, only to leave it home because it was too heavy for a hike. Start by defining your non-negotiables: your environment, skill level, and the task at hand. For a beginner photographer, a lightweight mirrorless body with polymer 80 a versatile zoom is gold. For a seasoned hacker building a drone, you need modular frames and soldering patience. Lay out your daily essentials—like tools for a repair kit or components for a survival pack—and test them under pressure. Essential gear selection is a blend of practicality and honest self-assessment. A list helps clarify:

• Assess your primary use case first
• Prioritize durability over flashy features
• Budget for one premium item that anchors the kit

The right fit feels like an extension of your own hands.

Top Manufacturers and Quality Indicators

Choosing the right kit starts with assessing your specific goals, whether for photography, camping, or gaming. A camera kit should prioritize sensor quality and lens versatility, while a survival kit demands durable tools and compact storage. Evaluate your environment—indoor studio needs differ vastly from rugged outdoor treks. Premium kit selection hinges on balancing budget with long-term usability. For example, pro-level gear offers durability but may overwhelm beginners. Prioritize modular components that allow upgrades without replacing the entire system.

The perfect kit adapts to your evolving skills, not just your immediate desires.

Test ergonomics firsthand and read trusted reviews. A poorly fitted backpack or awkward grip can ruin any adventure. Ultimately, the right kit empowers you to focus on the experience, not the equipment.

Common Mistakes and How to Avoid Them

One frequent mistake in English is the misuse of homophones, such as “their,” “there,” and “they’re.” To avoid this, proofread carefully and learn the distinct meanings of each term. Another common error involves incorrect verb tense consistency, especially when shifting between past and present. A practical solution is to map out the timeline of your text before writing. Additionally, many learners struggle with subject-verb agreement, particularly with collective nouns. To prevent this, identify the main subject of the sentence and ensure the verb matches it in number. Mastering these common mistakes in English significantly improves clarity. Focusing on SEO content writing requires precise language, so always double-check subject-verb pairs and homophone usage to maintain readability and search engine rankings.

Errors in Jig Alignment and Fixture Setup

Learners often confuse “its” (possession) with “it’s” (contraction for “it is”), and misuse “their,” “there,” and “they’re.” To avoid this, proofread for homophones and understand each word’s grammatical role. Common grammar mistakes in English also include incorrect subject-verb agreement, such as saying “he don’t” instead of “he doesn’t.” Misplacing modifiers can change sentence meaning; place adjectives and adverbs next to the word they modify. Finally, avoid run-on sentences by using periods or conjunctions like “and” or “but.” Read sentences aloud to catch awkward phrasing.

Over-Drilling Critical Pin Holes and Pocket Depths

When learning English, common mistakes like confusing “their,” “there,” and “they’re” can trip anyone up. To avoid this, always read your sentences aloud to check meaning. Another frequent error is misusing tenses, such as saying “yesterday I go” instead of “yesterday I went.” Slow down and think about the time frame before speaking or writing. Practical grammar tips for ESL learners include keeping a small notebook for recurring errors. Also, watch out for literal translations from your native language, which can sound unnatural. Practice with native content, like podcasts or shows, and don’t be shy about asking for feedback. Repetition and patience are your best friends here.

Overlooking Tolerance Checks Before Assembly

Learning English can feel like navigating a minefield, especially with common pitfalls like false friends (words that look familiar but mean something different) or mixing up “your” and “you’re.” To avoid these, always double-check your homophones and practice context. A huge one is overcomplicating sentences—keep it simple. Another classic mistake is translating directly from your native language, which often sounds awkward. You can avoid this by reading more English content and thinking in English, not translating. If you struggle with pronunciation, record yourself and compare it to native speakers. The key? Embrace mistakes as learning tools, not failures. Remember: it’s better to say “I go store” and be understood than to say nothing at all.

Legal Considerations Every Builder Should Know

Every builder must prioritize zoning laws and property surveys before breaking ground, as violating local codes can halt projects and incur fines. Securing proper permits is non-negotiable; failing to do so risks legal action and forced demolition. Understanding contract law is critical—clear, written agreements with subcontractors and suppliers prevent disputes over payment, timelines, and liability. Adhering to safety regulations like OSHA standards shields you from lawsuits and penalties. Additionally, environmental compliance regarding waste disposal and protected species is mandatory. Lien laws also demand attention; improper filings from unpaid laborers can stall your project. Always consult a construction attorney to navigate these complexities and safeguard your business.

Federal Regulations and ATF Guidance

Navigating legalities is a critical part of any construction project. One key area is securing proper permits and zoning approvals before breaking ground. Understanding local building codes ensures your project stays compliant from day one. You also need a solid contract that clearly defines scope, payment schedules, and dispute resolution. Don’t overlook liability and insurance requirements—your general liability and workers’ comp policies must cover all subcontractors. Finally, always check for lien waiver requirements to protect against payment disputes. Staying on top of these basics keeps your projects running smoothly and avoids costly legal headaches.

State-Specific Restrictions on Self-Manufactured Firearms

Every builder must prioritize understanding zoning laws and building codes before breaking ground. Securing proper permits is a non-negotiable legal requirement that protects against fines, project shutdowns, and liability. Additionally, you must navigate contract law by using written agreements that clearly define scope, payment schedules, change orders, and dispute resolution. Neglecting these clauses can lead to costly litigation. Liability insurance and workers’ compensation coverage are similarly critical, as they shield your business from injury claims and property damage lawsuits. Finally, ensure compliance with environmental regulations regarding waste disposal and runoff, as violations often carry severe penalties. Ignorance of these legal foundations exposes you to serious financial and reputational risks.

Record-Keeping and Serialization Requirements

Navigating legal stuff might not be as exciting as picking out tile colors, but ignoring it can bankrupt you. Understanding building contracts is a non-negotiable safeguard for any project. You need a rock-solid written agreement that clearly defines the scope of work, payment schedule, and change order process—handshake deals are a fast track to disputes. Also, secure all required permits before breaking ground; unpermitted work can lead to fines, stop-work orders, and trouble selling the house later. *Liability insurance isn’t a luxury—it’s your shield against a single accident wiping you out.* Be aware of lien laws: if you don’t pay a subcontractor or supplier, they can put a lien on the property, which can block your sale or refinancing. Lastly, follow safety regulations (like OSHA standards) religiously—a serious job site injury can trigger investigations and lawsuits that destroy your reputation.

Cost Comparison: Kits Versus Completed Firearms

When weighing cost comparison between kits and completed firearms, building from a kit nearly always offers superior value for the budget-conscious shooter. A complete rifle from a manufacturer carries a built-in premium for labor, assembly overhead, and brand markup, often costing 20-40% more than its component parts. Conversely, a receiver kit—especially for AR-style platforms—usually excludes only the stripped lower, which you can source affordably. By assembling the upper and lower yourself with a simple set of tools, you bypass skilled labor charges and gain a deeper understanding of your firearm’s mechanics. For those willing to invest a few hours, kit building delivers professional-grade performance at a fraction of the retail price. The savings become even more pronounced when you hunt for deals on barrels, handguards, and bolt carrier groups individually. Ultimately, the financial advantage of kits is undeniable, making them the smarter choice for builders who value both cost efficiency and customization.

Total Expense of Tools, Jig, and Raw Components

Building a firearm from a kit often feels like a weekend project with hidden costs, while buying a completed gun is a single, predictable transaction. The cost breakdown of 80% lowers vs complete firearms reveals that kits typically save 20–30% on the base price but demand additional investments in jigs, drill presses, and finishing tools that can offset any savings. For example:

• Kits: Lower receiver $50–$150 + parts kit $200–$400 + jig/tools $100–$300 = total $350–$850.
• Completed firearms: Factory-assembled rifle $500–$1,200 (no extra tooling).

While the kit route saves upfront cash, the true cost emerges when you factor in hours of labor and the risk of mistakes—like a misaligned trigger pin that ruins the receiver. A completed firearm, though pricier initially, comes with a warranty and immediate function.

Q&A:
Is a kit always cheaper?
Not if you lack tools. A simple build can cost as little as $400 ($50 lower + $250 parts + $100 jig rental), but a custom high-end kit with professional tooling can exceed a basic factory gun’s price. Always compare total project cost, not just the receiver.

Long-Term Savings for Frequent Builders

When you’re weighing cost, building from a kit often saves you 10–20% compared to buying a completed firearm, especially for popular models like AR-15s. Building from a kit offers significant savings for DIY enthusiasts. You avoid paying for the manufacturer’s labor and assembly, but you’ll need to invest in tools (like a vise and armorers wrench) and spend time learning. Pre-built guns come ready to shoot with a warranty, making them the hassle-free choice. Just remember, a kit’s true cost includes your time and tools. For example:

• Kit: ~$400–700 for parts, plus $50–150 in tools. Final price ~$500–850.
• Completed: $600–1,200 fully assembled, often with a factory warranty.

Your budget and patience will decide which route fits best.

Hidden Costs: Time, Mistakes, and Upgrades

When weighing DIY gun kits against store-bought completed firearms, the cost difference is often surprising. A kit typically saves 20–40% upfront because you skip the labor of a gunsmith or manufacturer, making it a budget-friendly entry point for hobbyists. However, you’ll need tools like a vice and drill press, which add to your initial spend, whereas a completed firearm is ready out of the box with no hidden gear costs. For example, an AR-15 kit might run $400 versus $700 for a pre-built model, but you’ll sink another $100 into tooling if starting from scratch. Ultimately, kits shine if you already have a workshop, while completed firearms win for pure simplicity.

Value-added assembly kits
let you stretch your dollar further.

• Kit cost: Lower purchase price, plus potential for upgrades
• Completed cost: Higher buy-in, but zero extra tool or time investment

Q: Is a kit actually cheaper long-term?

Advanced Customization Options After Finishing

Once your base coat is dry, the real fun begins with advanced customization options that truly make the project your own. You can experiment with unique surface textures by applying a clear gel or texture paste, then sanding it down for a worn, industrial feel. For a glossy, professional-grade finish, try a cold-cure epoxy resin that self-levels and creates a glass-like shell. Another trick is using liquid masking film to protect specific areas while you spray contrast colors or metallic flakes, giving you razor-sharp lines. Want a satin, soft-touch feel? A matte top coat applied with a sponge creates a velvety finish that resists fingerprints. These layer-by-layer tweaks let you shift from mass-produced to truly handmade without needing new tools or materials.

Anodizing, Cerakoting, and Surface Finishing

Advanced customization options after finishing allow for precise tailoring of final products to specific performance needs. Post-processing surface modifications can dramatically alter tactile feel and visual appeal, from matte texturing to high-gloss polishing. Common after-finish enhancements include:

• Chemical etching for micro-texturing and improved adhesion
• Digital printing for adding logos or intricate patterns
• Selective coating removal to create contrast with the base material
• Laser engraving for permanent, wear-resistant markings

These techniques are typically applied after the primary finish has cured, ensuring the base protective or aesthetic layer remains intact. For industrial components, balancing additional processing time against functional gains—such as anti-glare properties or enhanced grip—is critical. Always test on scrap pieces to verify adhesion and durability before full application.

Installing Upgraded Trigger Groups and Safety Selectors

Advanced customization options after finishing allow users to tailor colors, textures, or performance characteristics to exact specifications. For painted or coated surfaces, this may include applying a clear topcoat for enhanced durability, adding metallic flakes for a premium look, or using matte finishes to reduce glare. For manufactured goods, post-finishing options often involve laser engraving serial numbers, applying protective laminates, or adjusting surface hardness through secondary heat treatments. Post-finishing customization maximizes product value and fit.

Post-finishing treatments can transform a standard surface into a specialized asset, meeting niche industrial or aesthetic requirements.

Optimizing Ergonomics with Aftermarket Grips and Stocks

Once the final coat of paint has sealed a wooden piece, the true artistry begins with advanced customization options. Post-finish distressing techniques transform a pristine surface into a narrative of age and use, as skilled artisans wield chains, hammers, and wire brushes to dent, scratch, and wear down the finish. This deliberate weathering, often layered with tinted waxes or glazes, creates depth in crevices that simulates decades of honest wear. The result is not a flaw, but a crafted history, where each mark tells a silent story of forgotten hands and quiet rooms, elevating a simple object into an heirloom with palpable soul.

Frequently Asked Questions About Self-Built Receivers

Frequently asked questions about self-built receivers often center on component sourcing, circuit complexity, and regulatory compliance. Builders commonly ask about selecting appropriate RF front-end components like mixers and filters to ensure adequate selectivity. Another frequent inquiry involves the necessity of a stable local oscillator, where builders often debate between using crystal-controlled or variable frequency oscillators. Many also question the required shielding techniques to prevent local oscillator radiation, which could cause interference. Finally, enthusiasts frequently seek clarity on whether a self-built receiver requires certification, as most low-power designs for hobbyist use fall under Part 15 exemptions, though verification of local regulations is always advised to ensure legal operation.

Can You Legally Transfer an 80 Percent Build?

When constructing a self-built receiver, common inquiries often center on components and performance. A frequently misunderstood area is the receiver sensitivity calibration required for optimal signal clarity. Builders typically ask how to minimize RF interference from local electronics, which can degrade DIY designs. Key considerations include:

• Choosing a reliable local oscillator and IF filter for frequency stability.
• Proper grounding techniques to reduce noise floor.
• Selecting appropriate enclosure shielding to prevent signal bleed.

Q: Why does my self-built receiver pick up only strong stations?
A: This usually indicates insufficient front-end gain or poor antenna matching—check your LNA stage and ensure your impedance matches 50 or 75 ohms. Always verify component tolerances with a multimeter before soldering.

What If You Make an Irreparable Error During Milling?

Many enthusiasts ask about the legalities and performance of self-built receivers, particularly concerning compliance with FCC regulations. The most critical point is that a home-built receiver must not cause harmful interference and must accept any interference it receives. Understanding RF circuit design principles is essential for success. Common queries include questions about soldering techniques, component sourcing for SMD parts, and troubleshooting local oscillator drift. A stable local oscillator is the heart of any reliable design, not an afterthought. Builders also frequently inquire about selecting the right software-defined radio (SDR) front-end versus traditional discrete component designs. To clarify, here are the core considerations:

• Legal compliance: Requires Part 15 compliance for intentional radiators.
• Component quality: Low-noise amplifiers (LNAs) and precision crystals are non-negotiable for sensitivity.
• Testing: Always test with a known reference signal before assuming the receiver works.

Ultimately, a well-planned self-built receiver can match commercial performance, provided you prioritize shielding and proper ground-plane layout.

How Does the Process Compare to Standard AR Assembly?

Frequently asked questions about self-built receivers often focus on performance versus commercial units. Many enthusiasts ask whether a DIY receiver can match factory sensitivity—the answer is a confident yes, provided you properly align the local oscillator and IF stages. You also face common queries about component sourcing for DIY receiver for beginners, where we recommend starting with a simple superheterodyne design using a NE612 mixer and LM386 audio amp. Regarding antenna requirements, a long wire of 10–20 meters suffices for most shortwave bands. Builders also worry about shielding: remember that a metal enclosure and ferrite beads on power leads eliminate most RF interference. Finally, no question recurs more than troubleshooting—check your soldering joints first, then DC voltages at each transistor pin. With patience, your self-built receiver will outperform many entry-level store-bought units.