Smith & Wesson M&P 40 BLOWBACK .177 Caliber Steel BB Air Gun Pistol Drop-free 15-shot magazine. Authentic replica. Velocity (FPS): 480 Full metal barrel and slide. Front Sight Type: Adjustable for windage Push button magazine release. Trigger action - single Fixed front and rear 3 dot sights Refer user manual for troubleshooting steps Item does not operate when out of CO2. Need to change the CO2