The Beretta PM series of submachine guns were released in the late 1950s. This airsoft version is a replica of the 9mm but it only shoots 6mm airsoft BBs. It is a spring-operated airsoft gun. Just pull the foregrip back and push it back forward and fire. Simple as that. Easy load removable magazine. This is the clear body version great for private backyard wars and fun plinking off the back porch or deck. Consider using .20g airsoft BBs for the best accuracy.