This Aero Precision M5 features an 18" Faxon Big Gunner barrel, a VG6 Gamma muzzle brake, a Toolcraft black nitride bolt carrier group with dual ejectors, an Aero Precision Breach ambidextrous charging handle, an Aero Precision S-One M-Lok handguard, a BCM pistol grip, and a Magpul MOE rifle stock. One 10-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.