AR Parts in 5.56x45mm NATO

CMMG Mk4 5.56x45mm NATO Endeavor Upper Group Receiver 18in Sniper Grey

CMMG Mk4 5.56x45mm NATO Endeavor Upper Group Receiver 18in Midnight Bronze

CMMG Mk4 5.56x45mm NATO Endeavor Upper Group Receiver 18in Coyote Tan

CMMG Mk4 5.56x45mm NATO Endeavor Upper Group Receiver 18in Charcoal Green

CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Tungsten

CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Titanium

CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Charcoal Green

TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver Pencil Mid Length1-7 Twist 1/2x28 A2 Black

TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver M4 Carbine Length 1-7 Twist 1/2x28 A2 Black

TRYBE Defense Rifle Barrel and TRYBE Defense Self-Timing Muzzle Brake .22 Caliber/5.56 1/2x28

TRYBE Defense Medium Profile AR-15 Rifle Barrel .223 Wylde 20 in Black

TRYBE Defense AR Small Parts Kit AR-15/M-16 5.56mm Black

Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group - Nickel Boron

Dirty Bird Industries Enhanced Bolt Carrier Group .223/5.56 - DLC

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

Dirty Bird 10.3" 5.56 NATO 1:8 V2 M-LOK Upper Assembly - OD Green

Dirty Bird 10.3" 5.56 NATO 1:8 V2 M-LOK Upper Assembly - FDE

Dirty Bird 16 RECCE V2 5.56 M-LOK Upper Assembly

Dirty Bird 16 RECCE V2 5.56 M-LOK Upper Assembly

Dirty Bird 16 RECCE V2 5.56 M-LOK Upper Assembly

Dirty Bird 16 RECCE V2 5.56 M-LOK Upper Assembly

Dirty Bird 16 RECCE V2 5.56 M-LOK Upper Assembly

Dirty Bird 7.5" Pistol 556 M-LOK Complete Upper - FDE

Spikes Tactical Upper 5.56 16in CHF Midlength w/ 13.2in SAR3 Rail