All those are the only real copy handguards which have minimal hex headed screws that maintain the heat shields set up. The replica Colt handguards actually have rivets (just like the serious matter) Keeping the warmth shields in position. It has the early reciever without fence round the mag release https://bookmarknap.com/story8713426/the-2-minute-rule-for-colt-combat-unit-rail-gun-45