This Desert Tech MDRX features an ambidextrous mag release and safety, a 1/2x28 threaded muzzle, and a 1:8 twist rate. Purchase includes the original hard case, manual, and one 30-round magazine. 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.