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Lower Assembly

Lower Assembly

Complete your AR build with a quality, mil-spec lower assembly.

Being able to easily customize your AR build is what drives most shooters to owning a black rifle (or pistol) in the first place. After all, few weapon platforms can provide instant caliber and configuration swaps without any specialty tools or a gunsmithing bench. To make swapping configurations easy - and to help new builders finish your first AR as quickly as possible - we've introduced lower assembly options.

"What's a lower assembly?"

An AR-15 lower assembly is the "bottom half" of your build: Each includes a complete lower parts kit, buffer tube and buffer with recoil spring, and a buttstock or pistol brace. Most importantly, these lower assemblies include billet or forged 80% lowers - some even include the finishing jig with tooling!

New here? Read our guide: How to Build an AR-15 first!

Importantly, these lower assemblies are not assembles and they are not considered firearms in most states. You, the builder, must fabricate your 80% lower to make it a firearm that's functional under federal law. Next, install your parts kit, throw on your upper assembly and hit the range!

Why Our Lowers? Specs & Features:

Available Calibers

  • LR-308/AR-10 lower assemblies are compatible with .308 Winchester and 6.5 Creedmoor uppers.
  • AR9 (9mm) assemblies are compatible with AR9 uppers, PSA 9mm bolt carrier groups and barrels.
  • 5.56/.223 assemblies are compatible with 5.56 NATO, .223 Win, 6.5 Grendel, and 300 Blackout builds.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.