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 and the mainspring slides out of the bottom of the grip frame to reveal a hex key for piercing the CO2 cartridge. Like the M45 issued to Marines as well as the commercial version, the Umarex model features the flat, desert-tan-color on a metal slide. The frame is a polycarbonate substrate with black poly grips. You'll also notice the under-barrel Picatinny rail, 3-dot sights of which the rear is adjustable for windage, flat serrated mainspring with lanyard loop, enhanced Commander-style hammer, long, solid trigger, and ambidextrous safety lock. For those familiar with the Colt M1911A1, physical handling of the M45 airgun is very similar. The airgun is manufactured to dimensional spec so that it fits duty holsters. The trigger pull comes in at 4.25 pounds. The trigger pull comes in at 4.25 pounds. The overall weight of this airgun is 1.75 pounds.