This Knight's Armament rifle comes with one 30-round magazine, a 14.5" barrel with a permanently attached 2" muzzle device, and is equipped with a Centurion Arms coated sandcutter bolt carrier for enhanced reliability and performance. Get the best bang for your buck when you get a Certified Used Firearm. When you see the Certified Used stamp on any of our firearms, you can be confident that you're getting exactly what you want - a gun only in very good to excellent condition and held to the highest quality standard. All Certified Used Guns come with a 'no questions asked' return policy.