This Shadow Systems MR920 features a threaded barrel, a Night Fision front night sight, and a Holosun HS507C X2 optic. It includes three 15-round magazines, a soft range bag, and extra backstraps. 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.