6mm Bulldog BB Pellets have been designed to optimise the performance of all Airsoft BB Guns including; Co2 operated, Airsoft BB Guns with Hop Up, Shotguns, Single shot Rifles, most good quality entry level BB Guns and High end (AEG) Electric Rifles. These BB Pellets are calibrated and have a smooth polished surface, with no ridges or imperfections, making this product the best you can buy for your 6mm Airsoft BB Gun.