AR Parts in 5.56x45mm NATO

Rainier Arms RUC DI 5.56 NATO Complete Upper 16in Black Medium

Rainier Arms Mountain MOD2 5.56 NATO Barrel 16in 1/2x28 Mid Len Black Medium

Rainier Arms Mountain MOD2 5.56 NATO Barrel 14.5in 1/2x28 Mid Len Black Small

Rainier Arms Mountain MOD2 5.56 NATO Barrel 12.5in 1/2x28 Mid Len Black Small

Rainier Arms Mountain MOD2 5.56 NATO Barrel 10.5in 1/2x28 Carbine Len Black Small

Rainier Arms AR-15 5.56/.223 Precision Match Grade BCG Black Nitride Small

Lead & Steel Standard Bolt Carrier Group 5.56x45mm

LEAD & STEEL All-Rounder Carbine Upper Receiver 5.56 13.9" FDE

LEAD & STEEL All-Rounder Carbine Upper Receiver 5.56 13.9" ODG

LEAD & STEEL Just As Good Upper 5.56mm 18" FDE

LEAD & STEEL ARC Mil-Spec Stripped Upper Gray

LEAD & STEEL Just As Good Upper 5.56mm 16" ODG

Lead & Steel AR-15/AR-16/M4 5.56x45mm NATO/.300 AAC Blackout/.223 Remington M16 Complete Bolt Carrier Group Nitride Black

LEAD & STEEL ARC 5.56/300 Blk TIN Bolt Carrier

LEAD & STEEL ARC 5.56/300 Blk DLC Bolt Carrier

Tyrant Designs TD-CB223 CyberBrake-Compensating Muzzle Brake - Raw Steel

Tyrant Designs TD-CB223 CyberBrake-Compensating Muzzle Brake - Black

BASTION THRDD TRGR GRD 5.56 AR FLAG

AR-STONER AR-15 Classic Complete Upper Receiver Assembly 5.56x45mm NATO 16" Barrel

Andro Corp Industries Barrel 5.56 NATO 8 inch Medium Contour Pistol 1-7 Twist 1/2x28 Thread Black Black

AR-STONER T-Series AR-15 Unassembled Rifle Upper Receiver Kit 16" Barrel 5.56x45mm NATO

AR-STONER T-Series AR-15 Unassembled Pistol Upper Receiver Kit 5" Barrel 5.56x45mm NATO

AR-STONER T-Series AR-15 Unassembled Pistol Upper Receiver Kit 7" Barrel 5.56x45mm NATO

AR-STONER AR-15 Pistol Kit 5" Barrel 5.56x45mm NATO Standard Buffer System