5.56x45mm NATO Receivers

BCM BCM4 Mod-0 AR-15 Complete Lower Receiver Anodized Flat Dark Earth

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 11.5" Cold Hammer Forged Barrel M-LOK Black

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm with Pinned 14.5" Cold Hammer Forged Barrel M-LOK Black

Battle Arms Development Workhorse AR-15 Upper 16 Barrel 5.56 NATO 15 M-LOK Handguard

Battle Arms Workhorse AR-15 Pistol Barreled Upper Receiver 5.56x45mm NATO 9.5" Barrel

Faxon AR-15 ARAK-21 Complete Upper Receiver 5.56x45mm NATO 16" Barrel

Smith and Wesson M&P-15 Lower Receiver 5.56 NATO Stripped

One Horse OH-15 Complete Upper 5.56 16 Barrel SOCOM Profile

Geissele USASOC URG-I Near Clone AR-15 Pistol Complete Upper Receiver Improved Complete 5.56x45mm NATO 10.3" Barrel with Surefire SF4P

BCM MK2 RMS-M1T0 Mod-0 AR-15 Complete Lower Receiver Anodized Flat Dark Earth

Midwest Industries AR-15 Pistol Barreled Upper Receiver 5.56x45mm NATO 10.5" Barrel

Primary Weapons Systems MK1 Mod 2-M Complete Lower 5.56 30-Rounds

Colt AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 14.5" Barrel

One Horse OH-15 Complete Lower 5.56 / .300 AAC Blackout

One Horse OH-15 A3 Stripped Upper Multi-Cal

Aero Precision M4E1 Pro Ambidextrous AR-15 Stripped Lower Receiver OD Green

American Defense UIC Stripped Lower 5.56/.223

Radian Weapons A-DAC 15 Builder Kit Black 5.56 8.5 Handguard

Radian Weapons R0427 Model 1 Multi Caliber N/A Cerakote Ambidextrous

BCM BCM4 Mod-2 SOPMOD AR-15 Complete Lower Receiver Anodized Black

Primary Weapons System MK1 Mod 2-M AR-15 Ambidextrous Stripped Lower Receiver Anodized Black

Geissele AR-15 Super Duty MOD1 Pinned and Welded Complete Upper Receiver 5.56x45mm 13.9" Cold Hammer Forged Barrel M-LOK Black

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 10.3" Cold Hammer Forged Barrel M-LOK Black

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 11.5" Cold Hammer Forged Barrel M-LOK DDC