The Umarex Beretta PX4 Storm Spring Powered Pistol Airsoft Gun is made primarily from plastic that keeps the load and price down. The PX4 Storm is operated by racking the slide which cocks the spring for one shot. The spring system utilized in this gun allows it to be very affordable; however it’s not skirmish ready, but does have some realistic features for prop use, like realistic sights, slide cocking serrations, textured grip and magazine release.