If you want an AR pistol rugged enough for the top federal law enforcement agencies in America, choose Rock River Arms. This LAR-15 10.5 Inch A4 Pistol features an optics-ready platform with a forged aluminum upper receiver and a lightweight aluminum M-LOK compatible freefloat handguard. Chambered in 5.56 NATO is also accepts .223 Remington and delivers fantastic performance with Rock River's single stage trigger. It comes with a SB Tactical SBA3 adjustable stabilizing arm brace and a Hogue rubber pistol grip for ultimate control. This precision built pistol has a 10.5" chrome lined chrome moly barrel with a 1:9 twist that is threaded 1/2x28 TPI with an A2 flash hider. - CALIBER .223 REM/5.56MM NATO - MAGAZINE (1) with 30rd capacity - BARREL 10.5" Chrome Lined Chrome Moly Barrel with a 1:9 Twist, Threaded 1/2x28 TPI with A2 Flash Hider - RECEIVERS Forged Aluminum RRA LAR-15 / M4 - HANDGAURD 9.25" RRA Lightweight Aluminum Free Float M-LOK - TRIGGER RRA Single Stage Trigger - GRIP Hogue Rubber Pistol Grip - STOCK SB Tactical SBA3 Adjustable Stabilizing Arm Brace