The realistic Blowback function makes the slide move back and load a new 4.5 steel BB into the chamber, thus adding a more realistic shooting experience. The slide locks back on the last shot, requiring you to manipulate the slide lock or the slide itself when inserting a full magazine. The magazine holds 16 4.5 steel BBs. The texturized grip allows for better pistol control and target acquisition. Every pistol comes with its own unique serial number. It is powered by a 12g CO2 cartridge for reliable and consistent performance, coupled with a comfortable ergonomic design, this airgun will deliver a quality experience