The bolt within a closed-bolt, semi-automatic variant of the Uzi submachine gun functions as a critical component of the firearm’s operation. It cycles back and forth with each trigger pull, stripping a fresh cartridge from the magazine, chambering it, and then locking into place against the breech face. Upon firing, the bolt absorbs the recoil, extracts and ejects the spent casing, and because of the semi-automatic configuration remains open until the trigger is pulled again, initiating the cycle anew. This type of action differs from fully automatic counterparts where the bolt continues cycling automatically until the magazine is emptied or the trigger is released.
The closed-bolt, semi-automatic design contributes to improved accuracy compared to open-bolt designs, often found in fully automatic versions. This is achieved through the consistent positioning of the cartridge within the chamber prior to ignition. Historically, the original Uzi was designed for fully automatic fire, but semi-automatic versions were later developed for civilian markets and law enforcement agencies where full auto capabilities are often restricted. These civilian-legal versions maintain the Uzi’s compact and recognizable profile while adhering to legal regulations.
