Individuals are the one copy handguards which have small hex headed screws that hold the heat shields in place. The replica Colt handguards actually have rivets (just like the real factor) holding the warmth shields in place. Indeed, I'm sure the upper receiver is Colt, combined with the BCG. It https://coltcombatunitrailgun4578888.blogozz.com/30630511/the-basic-principles-of-colt-combat-unit-rail-gun-45