This WC-10 pairs an OD green finish with a polymer stock system and rubber pistol grip. It features an optic-ready receiver with uninterrupted top Picatinny rail, 18" fluted barrel, rifle-length direct impingement gas system, and a 16" handguard rail with M-Lok attachment points. 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.