This Radical Firearms RF-15 includes one 30-round magazine, a B5 Systems stock and pistol grip, and a 15" M-LOK handguard. The rifle features a 1:8 twist barrel and is equipped with a Simmons red dot optic. 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.