5.56x45mm NATO Upper Receivers

Dirty Bird Industries 7.5 5.56 DRP Pistol M-LOK V2 Upper Assembly

Dirty Bird 10.5 Government Carbine 5.56 M-LOK Upper Assembly - V3, FDE

Dirty Bird 16" 5.56 NATO Govt M-LOK Upper Assembly V3 - Midnight Bronze

Dirty Bird 20" M16A2 Enhanced 5.56 Retro Upper Assembly - Chome-Lined

Dirty Bird 20" M16A2 Enhanced 5.56 Retro Upper Assembly - Non Chrome-Lined

Dirty Bird 16" RECCE V2 .223 Wylde M-LOK Upper Assembly

Dirty Bird 16" RECCE V2 .223 Wylde M-LOK Upper Assembly

Dirty Bird 16" RECCE V2 .223 Wylde M-LOK Upper Assembly

Dirty Bird 16" Govt Mid 556 M-LOK Complete Upper - OD Green

Dirty Bird 16" Govt Mid 556 M-LOK Complete Upper - Midnight Bronze

Dirty Bird 16" Govt Mid 556 M-LOK Complete Upper - Black

Spikes Tactical Upper 5.56 16in Midlength LE w/13.2in M-LOK Rail

Geissele Automatics Geissele Super Duty MOD1-A 5.56mm 11.5" Bbl Ambidextrous Black Pistol 08-674B

Stag 15 5.56 M4 Upper Receivers - Stag 15l Left Hand M4 Phosphate Upper

Stag 15 5.56 M4 Upper Receivers - Stag 15 M4 Phosphate Upper

Stag 15 5.56 18in 3gun Elite Upper Receivers - Stag 15 3gun Elite Upper

Stag 15 5.56 7.5in Tactical Nitride Upper Receivers - Stag 15l Left Hand Tactical 7.5'''' Nitride Upper

Stag 15 5.56 7.5in Tactical Nitride Upper Receivers - Stag 15 Tactical 7.5'''' Nitride Upper

Stag 15 5.56 10.5in Tactical Nitride Upper Receivers - Stag 15l Left Hand Tactical 10.5'''' Nitride Upper

Stag 15 5.56 10.5in Tactical Nitride Upper Receivers - Stag 15 Tactical 10.5'''' Nitride Upper

Stag 15 5.56 16in Tactical Nitride Upper Receivers - Stag 15 Tactical Nitride Upper

Stag Arms AR-15 5.56 Carbine M4 Upper Left-Handed Upper Assembly

Troy A4S Complete Upper Receiver 5.56x45mm NATO 11.5" Barrel

Sig Sauer MCX Rattler 5.56 NATO 5.5" M-LOK Upper Receiver UAMCX-5B-556-BLK-TAP