This Good Time Outdoors Core 15 features a gas impingement system, Ergo grip rail covers, and Diamondhead flip-up iron sights. One 30-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.