AR-15 pistol build kits gather the major components for a compact AR pistol — a short barreled upper (commonly 7.5″ or 10.5″), handguard, gas block, bolt carrier group, charging handle, and pistol buffer setup, plus a lower parts kit. Kits ship with an 80% lower or without a lower, assembled or unassembled. They do not include a stabilizing brace or sights — add those to suit your build and current regulations. Choose from .223/5.56, 300 Blackout, 7.62×39, and 9mm; filter by barrel length, caliber, handguard, and finish.

AR-15 Pistol Build Kits

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Choosing an AR-15 Pistol Build Kit

A pistol kit is built around a short barrel and a pistol-length configuration — no stock. The main things to check are the lower option, the barrel length, and how you intend to set up the rear of the buffer. Here's how to read them.

With or without an 80% lower

"With 80% lower" kits include an unfinished lower so you have the full build; "no lower" kits include everything except the lower. The product title says which, and whether the upper ships assembled or unassembled.

What's in the kit

A representative complete kit includes an 80% lower (on "with lower" versions), a mil-spec upper, a chrome-moly barrel with nitride finish, a free-float or quad-rail handguard, a single-rail gas block, and a mil-spec bolt carrier group, plus charging handle, pistol buffer parts, grip, and lower parts kit. No brace and no sights are included. Exact contents vary by kit — check the listing.

Barrel length and caliber

Pistol kits use short barrels — most commonly 7.5" and 10.5" — paired with pistol-length gas. Match barrel length and caliber to your purpose: 7.5" is the most compact, while 10.5" gains velocity and smoothness. Calibers include .223/5.56, 300 Blackout (which excels from short barrels), 7.62x39, and 9mm.

Brace and buffer

These kits are pistol-configured — there's no stock. A stabilizing brace, if you choose to run one, is not included and is selected separately. Rules affecting AR pistols and stabilizing braces have been subject to legal challenges and change, so confirm current federal and state law before configuring your build.

Frequently Asked Questions

What's included in an AR-15 pistol build kit?

A short barreled upper (barrel, handguard, gas block, muzzle device, BCG, charging handle), a pistol buffer setup, grip, and lower parts kit. "With lower" kits also include an 80% lower receiver. No brace or sights. Exact contents vary by kit — check the listing.

Do these kits include a brace or sights?

No. Pistol build kits do not include a stabilizing brace or sights/optics — you add those separately. This lets you choose the brace and sighting setup that fit your build and current regulations.

What barrel lengths and calibers are available?

Most kits use 7.5" or 10.5" barrels, in .223/5.56, 300 Blackout, 7.62x39, and 9mm. Each caliber has its own subcategory for filtering.

What's the difference between "with lower" and "no lower" kits?

"With 80% lower" includes an unfinished lower; "no lower" includes everything except the lower. Choose based on whether you already have a lower.

Are AR pistols legal / do you need an FFL?

It depends on how a kit is configured and where you live, and the rules around AR pistols, braces, and unfinished receivers have changed and continue to evolve. Confirm current federal and state law and how a specific kit ships before ordering. This is general information, not legal advice.