10.5" 5.56 Nato 1:7 FCR MLOK AR-15 Upper | Radical Firearms

10.5" 2a Upper 556nato 10.5" M-lok Rail Bl

11.5" Dd M4v7s Upper Urg 11.5" 556nato

14.5" Colt Le6921 Upper 556nato 14.5"

14.5" Spike's Tactical ST-15 LE | 5.56 NATO Dynacomp Brake

16" 2a Upper 556nato M-lok Rail Black

16" 5.56 Nato RRage Mlok Upper | 1:9 Rock River Arms

16" Black Rain Spec15 Uppr 16" 556 Socom

16" Colt M4 Upper 5.56 16.1" Matech Sght

16" Dd M4v11 Upper Urg 5.56nato