16.5 10+1 Black Stock Gas Piston System Full Length Picatinny Top Rail BUIS w/Tritium Front Adjustable Sights 1/2x28 Threaded Barrel Model 223 Rem/5.56 NATO
18.5 30+1 Black Stock Gas Piston System Bayonet Lug Full Length Picatinny Top Rail BUIS w/Tritium Front Adjustable Sights 1/2x28 Model 223 Rem/5.56 NATO
16.5 30+1 Black Stock Gas Piston System Full Length Picatinny Top Rail BUIS w/Tritium Front Adjustable Sights 1/2x28 Threaded Barrel Model Left Hand Model
18.5 30+1 Black Stock Gas Piston System Bayonet Lug Full Length Picatinny Top Rail BUIS w/Tritium Front Adjustable Sights 1/2x28 Threaded Barrel Model 223 Rem/5.56 NATO