Lower Receivers

Most popular upgrade lower receiver. Forged 7075-T6 with integrated trigger guard, threaded bolt catch pin, and upper tension screw.

Budget-friendly mil-spec lower with blank left side for custom engraving. Best value entry point for AR builds.

Factory-assembled BCM lower receiver group with BCM stock, grip, receiver extension, buffer system, and PNT trigger installed.

Stripped 7075-T6 AR-15 lower with the Sabre ambidextrous bolt catch and release installed at the factory, in six finishes.

Forged matched upper-and-lower set with a pre-installed ambi bolt catch, threaded set screw in place of the bolt-catch roll pin, integral trigger guard, and flared magwell.

Injection-molded glass-reinforced polymer lower that converts the 9mm Stribog to CZ Scorpion magazines and standard AR-15 fire control components. PSA 35-rd Scorpion mags only feed reliably without modification.

Premium billet lower with integrated ambidextrous controls and 40% stronger magwell. Competition-grade features at duty-grade strength.

Quality forged lower from Centurion with M16 auto pocket and hand-finished details. Professional-grade mil-spec construction.

FN's military-marked forged lower with the M4 roll mark. FN builds the U.S. military's M4s, so this is the closest civilian receiver to a DoD contract carbine and the clone-correct base when enhanced lowers look wrong.

Forged 7075-T6 mil-spec stripped lower, the same receiver Geissele uses on their factory Super Duty rifles. Duty-grade tolerance control and Type III hardcoat at $175.

Billet 7075 aluminum Stribog lower that takes CZ Scorpion magazines and a standard AR-15 fire control group. The premium conversion base for an AR-trigger or FRT Stribog build.

Billet aluminum receiver that converts the CZ Scorpion EVO 3 / 3+ from straight blowback to ball-bearing delayed blowback, dramatically reducing recoil and bolt bounce

Billet aluminum Kuna lower that converts the gun to Magpul PMAG EV9 magazines and standard AR-15 fire control components.

Drop-in complete AR-15 lower with PSA Enhanced Polished Trigger and B5 Bravo stock. A strong plug-and-play value for builders who want the lower assembled.

Billet-machined matched upper-and-lower set with an ambi bolt release, integrated trigger guard, flared magwell, and four tuning set screws.

Matched forged receiver set cut for the ICAR magazine pattern, built for 6mm ARC and .338 ARC, with a pre-installed ambi bolt catch, threaded set screw, integral trigger guard, and flared magwell.

Premium billet lower with fully ambidextrous controls including the patented A-DAC bolt catch system.

Dedicated EPC-9 lower for Glock-pattern 9mm AR builds with proprietary magazine release, ejector, and LRBHO parts installed.

Matched M4E1 upper and lower receiver set with sequential serials and identical anodizing. Eliminates color mismatch and tolerance stacking.

Fully assembled UMP45 lower kit with a lever trip bar and installed active-reset device.

Lightweight forged 7075-T6 lower with 60-degree magwell and ambidextrous controls. Precision machined for superior fit and finish.

Monolithic 30% glass-filled nylon AR-15 lower with integral A1-length stock, buffer tube, grip, and trigger guard. WWSD-style ultralight at $80.

Professional-grade forged lower with integrated ambidextrous controls. LMT's proven MARS system in a forged package.

Scorpion-magazine AR9 lower from PSA's AR-V conversion kit, built around AR-V U9 and CZ Scorpion magazines.

Matched large-frame upper and serialized lower with a 12.5-inch quad rail, barrel nut, and mounting hardware in black.

Billet 7075 stripped lower whose SAEBR pads lock and release the bolt from either side without breaking grip.

Complete ambidextrous AR-15 lower with patented bolt catch-and-release paddle, billet stainless controls, and a 4.5 lb Hiperfire trigger installed.

Serialized Aero M5 lower for a DPMS Gen 1 / SR-25 magazine build, with M5-specific receiver controls and pins.

Lightweight billet 7075-T6 BAD lower receiver for premium AR-15 builds that prioritize weight savings and ambidextrous-control compatibility.

Mil-spec AR-15 lower setup for CMMG 9 ARC conversion magazines and 9mm Radial Delayed Blowback uppers.

Dedicated Colt SMG-style 9mm lower for builders who want straight metal magazines and CMMG Mk9 compatibility.

7075-T6 Gen 2 AR-15 lower with aggressive magwell styling, beveled magazine flare, oversized trigger guard, and threaded bolt catch pin.

Mil-spec 7075-T6 forged SOLGW lower with Type III hardcoat anodizing, tight receiver tolerances, and the Loyal 9 rollmark.

Forged 7075-T6 mil-spec lower with Spike's spider logo and bullet-pictogram selector markings. Low shelf, multi-cal, backed by a lifetime warranty.