CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten 55BDFF4-TNG. 5 5.56mm BANSHEE upper group with the Mk4/standard AR15 lower group of your choice to create a compact AR pistol or SBR that blends maneuverability with carbine like...
CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten 55BDFF4-TNG. 5 5.56mm BANSHEE upper group with the Mk4/standard AR15 lower group of your choice to create a compact AR pistol or SBR that blends maneuverability with carbine like...