This CMMG MK-4 features a mid-length system, a Magpul MOE PR adjustable stock, a BAD lever and vertical foregrip, an XTS pistol grip, a QD sling mount, a Caldwell 2-point sling, an extended charging handle, and a 1/7 twist. One 30-round magazine is included. 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.