5.56x45mm NATO Receivers

Foxtrot Mike-102 556 G2 Bufferless Lowers - 556 G2 Bufferless Lower Pic Rail Adapter W/Thrill Grip

Mike-102 Gen 2 Complete Uppers - Gen 2 Complete Upper 12.5'''' Midlength W/A2 Flash Hider

Centurion Arms CM4 5.56 Forged AR-15 Receiver Set

Battle Arms Development BATTLE ARMS AUTHORITY ELITE BILLET Lightweight AR-15 Receiver Set, 7075-T6 Aluminum, Ambi.

M4e1 Superlative Arms Piston Complete Upper Receiver Groups - Piston Upper 18in Ss Barrel 15in Handguard Ss Semi-Only

M4e1 Superlative Arms Piston Complete Upper Receiver Groups - Piston Upper 16in Barrel 15in Handguard Black

M4e1 Superlative Arms Piston Complete Upper Receiver Groups - Piston Upper 14.5in Barrel 12in Handguard Black

Strike Industries Ultimate Dust Cover AR-15 Ejection Port Cover Aluminum Flat Dark Earth

Strike Industries Ultimate Dust Cover AR-15 Ejection Port Cover Aluminum Black

Faxon Forged Complete AR-15 Upper Receiver Aluminum Black

Strike Industries Enhanced Ultimate Dust Cover Ejection Port Cover Capsule Pattern AR-15 Polymer Black

Wilson Combat Upper Receiver

Strike Industries Ultimate Dust Cover AR-15 Ejection Port Cover Aluminum Red

Wilson Combat AR Style Billet Upper Receiver 5.56 NATO

FightLite Industries MCR556DFRM Dual Feed Complete Upper Receiver 5.56x45mm 16.25" Barrel M-LOK Handguard

Daniel Defense MK12 SPR AR-15 Complete Upper Receiver 5.56x45mm NATO 18" Barrel

CMMG Resolute MK4 5.56 16.1 Barrel No BCG/Charging Handle

Geissele AR-15 Super Duty MOD1 Complete Upper Receiver 5.56x45mm 16" Cold Hammer Forged Barrel M-LOK Black

FightLite Industries Mission Configurable Rifle Upper 5.56 16.25 Barrel

Geissele USASOC URG-I Near Clone AR-15 Pistol Complete Upper Receiver 5.56x45mm NATO 11.5" Barrel

Luth-AR A2 Stripped Upper Receiver 5.56 / .223 Rem

Strike Industries Overmolded Ultimate Dust Cover AR-15 Ejection Port Cover Polymer Flat Dark Earth

Strike Industries Overmolded Ultimate Dust Cover AR-15 Ejection Port Cover Polymer Black

FightLite MCR Dual-Feed 16.25" Upper 5.56x45mm 1:7 Mil-Std 1913 Picatinny Rail, Black