AR Upper Parts

FN 20-100047 AR-15 5.56x45mm NATO 16″ M4 Profile Carbine Length Gas System, Black Phosphate Cold Hammer Forged Chrome Lined

FN 36421 AR-15 5.56x45mm NATO 16″ Carbine Length Gas System, Black Phosphate Cold Hammer Forged Chrome Lined

Proof Research 100639 AR-Style Barrel 6.5 Creedmoor 22″ Rifle +2 Length Gas System 1:8″ Twist 4 Grooves, 5/8-24 tpi, Carbon Fiber Wrapped

Proof Research 100561 AR-Style Barrel 300 Blackout 16″ Carbine Length Gas System 1:8″ Twist 5 Grooves, 5/8-24 tpi, Carbon Fiber Wrapped