The Adams Arms P1 delivers great performance in a durable, lightweight, and compact pistol platform. It comes chambered in 5.56 NATO with an 11.5 inch barrel. Features include an optics ready flat-top, an SB Mini brace, and a 30 round magazine. - CALIBER 223 REM/5.56MM NATO - MAGAZINE (1) 30rd capacity - BARREL 11.5" 4150 Chrome Moly Vanadium, A2 Flash Hider, 1/2"-28 tpi - RECEIVERS Aluminum - HANDGUARD M4 - BRACE SB Mini Pistol