This Aero Precision M5 includes one 20-round magazine and features a Magpul PRS GEN3 precision-adjustable stock, Magpul grip, and standard muzzle device. 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.