This Sig Sauer MCX Virtus features a gas-piston system, a foldable stock, a Midwest Industries alloy forend, and a 16.5" barrel with a permanently attached pinned and welded muzzle device. 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.