Not when they are considered a pistol because the stock detaches ,over 500fps they become restricted like the previous 2289 Backpacker.The Canadian version had a hole drilled in the valve to limit velocity.If you don't like the cold stay away from the 2240 CO2 ..........a pump is not affected which is why I had a 2289 built set at 495fps with a 14.3 dome.Guys would also zip tie a handwarmer on the CO2 tube in late fall or winter to keep the gas warm.Many dead grouse.