Umarex Glock 45 Gen 5 Blowback Green Gas airsoft pistol. This Glock 45 airsoft pistol comes with a polymer body with metal slide. Powered by Green Gas it has realistic gas blowback to simulate recoil and slide cycling. Glock 45 airsoft pistol features an ambidextrous slide release, accessory rail under the barrel to mount lights and lasers and traditional Glock iron sights.