The Umarex Stormfire brings full-auto firepower to the backyard range. CO2-powered and fed by a 400-round BB reservoir, it pushes .177 caliber BBs at 430 FPS with a cyclic rate of 2,000 rounds per minute - making it one of the most entertaining air rifles in the Umarex lineup. A polymer stock in brown finish keeps it lightweight and weather-tolerant, and included sights let you get on target right out of the box. .177 caliber BB CO2 powered 400-round reservoir capacity 430 FPS muzzle velocity Full-auto firing at 2,000 rounds per minute Functional bolt action Polymer stock in brown finish Includes sights