SIG Air ProForce P320 XCarry Green Gas Blowback Airsoft Pistol Uses 6mm airsoft BBs Semi-auto High efficiency full blowback action Brass inner barrel Aluminum locking XSeries slide 21-round green gas magazine Field strippable External hop-up adjustment through recoil guide rod Max. velocity: 320 FPS XSeries flat trigger with 90-degree break Ambidextrous thumb safety, slide catch, and reversible magazine release Textured grip Fixed front and rear white dot contrast sights Reflex sight mounting plate XSeries Grip Module with under-muzzle Picatinny accessory rail Uses flush-mount green gas magazine Overall length: 7.6" Weight: 24.96 oz.