COLT M4 CARBINE MAGPUL SL GRAY SECRETS

Charlie's gives new higher receivers, the factory rifle just take-offs have test fired by Colt.  Upper receivers are choose-offs from out in the box rifles in addition to are obtained as higher receiver assemblies.  Both are 100% similar.  We don't ship in Colt factory box.The advantage of the folding entrance sight is noticeable when making use