AR-15 Build Kits
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Out of stock
10.5" 5.56 Premium AR 15 Pistol Build Kit W/ M-LOK Handguard
Black Rifle Depot
MSRP: $599.95$529.9510.5" 5.56 Premium AR 15 Pistol Build Kit W/9.85" M-Lok Handguard The perfect AR 15 pistol build kit for your lower, without all the tools required to build it. Black Rifle Depot's complete AR 15 pistol build kits are made from the highest quality USA...MSRP: $599.95$529.95 -
Out of stock
16" 5.56 Premium Rifle Build Kit W/15" M-LOK Handguard
Black Rifle Depot
MSRP: $699.95$599.95Patriot 16" 5.56 Premium Rifle Build Kit W/15" M-Lok Handguard The Patriot 16" 5.56 Premium AR 15 Rifle Build Kit is the ultimate choice for anyone looking to build an AR 15 rifle from scratch. This build kit includes all the components...MSRP: $699.95$599.95 -
Out of stock
18" AR 15 .223 Wylde Rifle Build Kit
Black Rifle Depot
MSRP: $604.95$549.9518" AR 15 .223 Wylde Rifle Build Kit Everything you need to finish your lower—built for accuracy, built to last. The 18" AR-15 .223 Wylde Rifle Build Kit from Black Rifle Depot includes everything you need to complete your stripped lower receiver...MSRP: $604.95$549.95 -
Out of stock
16" 5.56 Premium Rifle Build Kit W/13" M-Lok Handguard
Black Rifle Depot
MSRP: $899.95$679.9516" 5.56 Premium Rifle Build Kit W/13" M-Lok Handguard The perfect AR 15 rifle build kit for your lower, without all the tools required to build it. Black Rifle Depot's complete AR 15 rifle build kits are made from the highest quality USA...MSRP: $899.95$679.95 -
Out of stock
11.5" 5.56 Premium AR 15 Pistol Build Kit W/9.85" M-LOK Handguard
Black Rifle Depot
$549.9511.5" 5.56 Premium AR 15 Pistol Build Kit W/9.85" M-Lok Handguard The perfect AR 15 pistol build kit for your lower, without all the tools required to build it. Black Rifle Depot's complete AR 15 pistol build kits are made from the highest quality USA...$549.95 -
16" 5.56 Standard Rifle Build Kit W/12" M-LOK Handguard
Black Rifle Depot
MSRP: $675.74$479.9516" 5.56 Standard Rifle Build Kit W/12" M-Lok Handguard The 16" 5.56 Standard AR 15 Rifle Build Kit with 12" M-Lok Handguard from Black Rifle Depot is the ultimate solution for those seeking a high-quality, complete AR 15 rifle build kit. This...MSRP: $675.74$479.95 -
Out of stock
16" AR 15 Complete Rifle Kit with 15" M-Lok Handguard
Black Rifle Depot
$599.9516" 5.56 NATO AR 15 Complete Rifle Kit with 15" M-lok Handguard This 16" 5.56 NATO AR 15 Complete Rifle Kit with 15" M-Lok Handguard comes with everything need to finish your AR 15 lower receiver. It is American made and assembled in the...$599.95 -
Out of stock
16" 5.56 NATO Cold Hammer Forged Rifle Build Kit
Black Rifle Depot
$769.9516" 5.56 NATO Cold Hammer Forged Rifle Build Kit The 16" 5.56 NATO Cold Hammer Forged Rifle Build Kit comes with the 16" Cold Hammer Forged Upper complete with M16 Black Nitride Bolt Carrier group and Mil-Spec charging handle. Also include is our...$769.95 -
16" AR-15 Complete Rifle Build Kit
Black Rifle Depot
MSRP: $654.95$429.9516" AR-15 Complete Rifle Build Kit - Dissassembled Introducing the 16" AR 15 Complete Pistol Build Kit – a comprehensive set for enthusiasts and builders alike. This kit's heart is the 16" 5.56 NATO Barrel, optimized for precision and durability. A...MSRP: $654.95$429.95 -
16" 5.56 NATO Super Slim AR-15 Rifle Kit
Black Rifle Depot
MSRP: $599.70$479.9516" 5.56 NATO Super Slim AR-15 Rifle Kit The Black Rifle Depot 16" 5.56 NATO Super Slim Rifle Kit is a built with a 16" 5.56 M4 profile 1:7 twist mid-length gas system and an A2 flash hider. It's covered by a 15" Ultralight M-LOK handguard and a limited...MSRP: $599.70$479.95 -
Dirty Bird 16" 5.56 NATO Govt M-LOK V3 Rifle Kit
Dirty Bird Industries
MSRP: $574.95$499.95Dirty Bird 16" 5.56 NATO Govt M-LOK V3 Rifle Kit This Dirty Bird 16" 5.56 NATO Govt M-LOK V3 Rifle Kit features a Black Nitride 16" Sub-MOA Government Profile barrel chambered in 5.56 with a 1:7 twist. Built on a top-tier Forged Upper Receiver and...MSRP: $574.95$499.95 -
7.5" AR-15 Complete Pistol Build Kit
Black Rifle Depot
MSRP: $559.95$399.957.5" AR-15 Complete Pistol Build Kit - Disassembled Introducing the 7.5" AR 15 Complete Pistol Build Kit – a comprehensive set for enthusiasts and builders alike. This kit's heart is the 7.5" 5.56 NATO Barrel, optimized for precision and...MSRP: $559.95$399.95 -
7.5" Slick Side Billet AR-15 Pistol Kit
Black Rifle Depot
MSRP: $539.95$399.957.5" Slick Side Billet AR-15 Pistol Kit The 7.5" Slick Side Billet AR-15 Pistol Kit offers AR enthusiasts an affordable yet high-quality upper assembly. This kit features a 7.5-inch nitride-treated barrel chambered in 5.56 NATO, ensuring durability and...MSRP: $539.95$399.95 -
Out of stock
AR 15 Rifle Build Kit with 20" Barrel
Black Rifle Depot
$799.95AR 15 Rifle Build Kit with 20" Barrel This AR 15 Rifle Build Kit comes with everything you need to finish your AR 15 or variant lower receiver. The kit includes a complete 20" AR 15 Upper with a A2 front sight post and carry handle with rear sight. Also...$799.95 -
7.5" 5.56 NATO AR-15 Pistol Kit
Black Rifle Depot
MSRP: $599.95$419.957.5" 5.56 NATO AR 15 Pistol Kit The 7.5" 5.56 NATO AR 15 Pistol Kit comes with everything need to finish your AR 15 lower receiver. This kit includes a complete 7.5" 5.56 NATO Pistol upper with Black Nitride M16 Bolt Carrier Group and mil-spec charging...MSRP: $599.95$419.95 -
16" 5.56 AR-15 Rifle Build Kit W/12" Quad Handguard
Dirty Bird Industries
MSRP: $584.95$519.95Dirty Bird 16" 5.56 AR 15 Rifle Build Kit W/12" Quad Handguard The perfect AR 15 rifle build kit for your lower, without all the tools required to build it. Black Rifle Depot's complete AR 15 rifle build kit with quad handguard is made from...MSRP: $584.95$519.95 -
16" AR-15 5.56 Standard Rifle Build Kit w/15" M-LOK Handguard
Black Rifle Depot
MSRP: $599.95$499.9516" 5.56 Standard Rifle Build Kit W/15" M-Lok Handguard The perfect AR 15 rifle build kit for your lower, without all the tools required to build it. Black Rifle Depot's complete AR 15 rifle build kits are made from the highest quality USA produced...MSRP: $599.95$499.95 -
Aero Precision 11.5" 5.56 M4E1 Threaded Pistol Build Kit
Aero Precision
MSRP: $830.00$759.95Aero Precision 11.5" 5.56 M4E1 Threaded Pistol Build Kit The Aero Precision 11.5" 5.56 M4E1 Threaded Pistol Build Kit is the pinnacle of design and functionality, combining top-tier components suited for enthusiasts seeking superior performance and...MSRP: $830.00$759.95 -
Aero Precision 16" AR-15 Rifle Build Kit - Pinned FSB
Aero Precision
MSRP: $689.95$629.95Aero Precision 16" AR-15 Rifle Build Kit - Pinned FSB The Aero Precision 16" AR-15 Rifle Build Kit is a complete assembly package designed for precision and reliability. This kit features the Aero Precision 5.56 Carbine Upper Assembly, which includes a...MSRP: $689.95$629.95 -
10.5" 5.56 NATO AR-15 Pistol Kit
Black Rifle Depot
MSRP: $589.79$429.9510.5" 5.56 NATO AR-15 Pistol Kit The 10.5" 5.56 NATO AR 15 Pistol Kit comes with everything need to finish your AR 15 lower receiver. This kit includes a complete 10.5" 5.56 NATO Pistol upper with Black Nitride M16 Bolt Carrier Group and mil-spec...MSRP: $589.79$429.95
Frequently Asked Questions about AR-15 Build Kits
- What is an AR-15 Build Kit?
An AR-15 Build Kit provides nearly everything you need to assemble an AR-15, excluding the lower receiver (legally considered the firearm). These kits typically include a complete upper receiver, a lower parts kit (LPK), and a buffer tube assembly, allowing enthusiasts to customize their rifles while assembling them from the ground up.
- Why doesn’t the AR-15 Build Kit come with a lower receiver?
The lower receiver is classified as the serialized firearm component under U.S. federal law and must be purchased through a Federal Firearms License (FFL) holder. By excluding the lower receiver, build kits can be sold without requiring background checks or the regulatory process associated with buying a complete firearm.
- Is an AR-15 Build Kit compatible with all AR-15 lower receivers?
Most AR-15 Build Kits are compatible with mil-spec lower receivers. However, proprietary features or unique dimensions, such as billet lowers or enhanced trigger guards, may require specific parts. Always confirm compatibility to avoid fitment issues.
- Do I need special tools to assemble an AR-15 Build Kit?
Basic hand tools are sufficient for assembly, but specialized tools like an armorer’s wrench, roll pin punch set, vise blocks, and a torque wrench can make the process easier and ensure safe, accurate assembly.
- What types of calibers are available for AR-15 Build Kits?
AR-15 Build Kits are available in calibers such as 5.56/.223 Remington, .300 Blackout, 7.62x39mm, 6.5 Grendel, and .224 Valkyrie. Your choice should depend on the intended use, such as home defense, hunting, or long-range shooting.
- Are AR-15 Build Kits easy to assemble for beginners?
Yes, AR-15 Build Kits are beginner-friendly with the help of detailed guides and online tutorials. While assembly requires attention to detail and patience, no specialized gunsmithing expertise is necessary.
- Do AR-15 Build Kits include sights or optics?
Most AR-15 Build Kits do not include sights or optics. This allows builders to select optics suited to their specific needs, such as red dots for close-quarters or scopes for long-range shooting.
- Is there any fitting required when using an AR-15 Build Kit?
Most AR-15 Build Kits adhere to mil-spec standards and fit together without issues. Minor fitting may occasionally be needed due to manufacturing variations and can often be resolved with proper lubrication or adjustments.
- Are there legal restrictions on building an AR-15 from a Build Kit?
In the U.S., it is legal to build an AR-15 for personal use as long as federal, state, and local regulations are followed. These include compliance with barrel length requirements, feature restrictions, and potential registration rules. Research local laws before starting your build.
- How do I know if an AR-15 Build Kit is good quality?
High-quality AR-15 Build Kits use materials like 7075-T6 aluminum for receivers and 4150 CMV steel for barrels. Look for reputable manufacturers, user reviews, and features like magnetic particle inspection (MPI) for critical components. Trusted brands like Aero Precision offer reliable, high-quality kits.