GETTING MY COLT M16A1 RETRO REISSUE TO WORK

This upper receiver traces its origins back some six several years to guns Colt made to the SCAR (Special Operations Forces Combat Assault Rifle) program of the U.S. Unique Functions Command (SOCOM). It's designed to obviate the need to get a independent many-rail handguard for mounting components, affording ideal alignment of add-ons mounted in-li