This is also known as the GLOCK 33. The GLOCK 33 is a pistol manufactured by GLOCK. It is a GLOCK 27 modified to fire the .357 SIG ammunition. It uses a modified slide, frame, .357 SIG barrel and magazine but is otherwise nearly identical in appearance to the GLOCK 27. It has a12 rounds magazine capacity. This is a spring gun and the slide must be cocked for each shot. It requires no gas or batteries to operate. Due to this feature, the costs of spring guns are significantly lower, as well as maintenance. They are the most durable of all airsoft guns because they have less pieces that can break. Spring guns are very reliable, affordable and handsome guns