The Terminator Max B&W S45 is a heavy duty airgun that provides for extreme energy and semiautomatic fire in .457 caliber. Simply put, it is one of the most powerful semi automatic airguns ever created, pushing 200 grain ammo up to 800 FPS. Featuring an adjustable folding stock, top Picatinny rail and a 13” barrel, the B&W S45 has everything you need for your high powered semi auto experience.