The Colt M4 CQB-R AEG is a great Airsoft M4 Rifle. Fully licensed Colt trademarks/logo M4 airsoft carbine with rails. Gun is primarily polymer built, with some metal components. The rail system, upper/lower body, furniture, stock sights, and Buffer tube are all plastic. The outer barrel, sling attachments, magazine, and other moveable parts are metal.