Sig Sauer SIG1 MPX Spring Rifle Single-shot Removable 3-position adjustable stock Uses 6mm airsoft BBs 26-round drop free magazine, 500 round reservoir Molded polymer construction Ambidextrous manual safety Max. velocity: 300 FPS (with .20g airsoft BBs) Full-length Picatinny optics rail Front and rear flip-up sights Picatinny handguard accessory rails Length (stock removed): 13.78", 17.91"-22.44" with adjustable stock