These are the only reproduction handguards which have small hex headed screws that hold the heat shields in position. The reproduction Colt handguards actually have rivets (just like the serious thing) Keeping the heat shields in place. The barrel is usually a 1970's or 1980's, for the reason that that https://colt-m16a1-for-sale89743.tdlwiki.com/1064311/5_easy_facts_about_colt_combat_elite_commander_45_acp_described