This CMMG MK3 features a Magpul ACS stock, a safety, an extended latch charging handle, a 12" Picatinny quad rail handguard, and a fluted barrel with a 1/10 twist and a muzzle device. Purchase includes five 20-round magazines. 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.