This FN-15 Guardian features a B5 buttstock, a threaded barrel with a standard muzzle brake, and an M-Lok alloy forend (showing some blemishes from use). Six 30-round magazines are 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.