Caliber: 5.56mm NATO. Capacity: 30-round magazine. Barrel: 16” 1:7” twist, free-floated inside M-LOK URX handguard. Weight: 6.3 lbs. Length: 32” to 35” overall. Stock: Magpul MOE. Sights: Post front, fully adjustable rear (300m sight). Features: URX-4 upper receiver; two-stage trigger, 30-round magazine. Black finish. Made in USA by Knight's Armament Co. SEE POLITICAL PANIC PRICING.