COLT M4 UPPER BLK

Colt Firearms LE6920CK-NHG Upper Kit Black 5.56NATO/.223Rem 16-inch

Colt Firearms LE6920 Complete Upper 5.56 NATO / .223 Rem 16 Barrel

Primary Weapons Systems MK1 Alpha LT 14.50" Railed Upper .223 Wylde 1:8 Mid-Length no BCG w/CH

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

BUSHMASTER M4 Type Patrolman Flat Top A4 Upper 5.56 16" Black

BUSHMASTER QRC Upper 5.56 NATO 16" - Black

Battle Arms Development WH556-URS-ODG Workhorse Upper Receiver Aluminum OD Green Anodized Receiver for AR15/M4