This .177 caliber Colt M45 CQBP with blowback is a variation of the 1911 Rail Gun that's enlisted by the U.S. Marine Corps. The M45 CQBP (Close Quarter Battle Pistol) by Umarex has a drop-free airgun magazine with a capacity of 19 rounds. Steel BBs are recommended for flawless function. They travel out of the smooth, metal barrel at a speed of 400 feet per second. The left grip plate removes for the loading of a 12 gram CO2 capsule.