5.56x45mm NATO Upper Receivers

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 10.5in 1-7 Twist 1/2 X 28 TPI 18.8in Coyote Tan

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Titanium

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Sniper Grey

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Midnight Bronze

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Coyote Tan

CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Charcoal Green

CMMG Mk4 5.56x45mm NATO Endeavor Upper Group Receiver 18in Tungsten

CMMG Mk4 5.56x45mm NATO Endeavor Upper Group Receiver 18in Titanium

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 Endeavor Upper Receiver Group 5.56x45mm NATO 18in Armor Black

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 Sniper Grey

CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Midnight Bronze

CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Coyote Tan

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 Government Mid Length 1-7 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

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