This 17DM-4 features a mid-length system, a Magpul MOE FDE pistol grip and adjustable stock, a vertical foregrip, a 1/7 twist, and a muzzle brake. Four 30-round magazines are 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.