The SCR pistol features a modern, high-impact polymer grip; free-floating FightLite M-Lok handguard; threaded barrel; MIL-STD 1913 flat top upper receiver that accepts most modern optics, night vision and thermal devices; multi-caliber, multi-caliber with Captive Push-Pin Takedown in the field by simply pressing two pins and exchanging one upper receiver assembly for another. Accepts any AR-15/M16 magazine.