This Knight's Manufacturing Co. SR-25 features a telescoping stock, an ambidextrous charging handle, MBUS Pro flip-up sights, a Knight's Manufacturing buffer, a Geissele Super 42 rifle-length recoil spring, and a dual port muzzle brake. Purchase includes a black hard case, one 20-round magazine, and the original recoil spring. 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.