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1912 kimber Caliber
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UZI Caliber Submachine Gun is a standard Uzi with a 10-inch (250 mm) barrel. It has a rate of automatic fire of 600 rounds per minute (rpm) when chambered in 9mm Parabellum; the .45 ACP model’s rate of fire is slower at 500 rpm.
The Uzi uses an open-bolt, blowback-operated design, quite similar to the Jaroslav Holeček-designed Czech ZK 476 (prototype only) and the production Sa 23, Sa 24, Sa 25, and Sa 26 series of submachine guns. The open bolt design exposes the breech end of the barrel, and improves cooling during periods of continuous fire.
the receiver is more susceptible to contamination from sand and dirt. It uses a telescoping bolt design, in which the bolt wraps around the breech end of the barrel
The magazine is housed within the pistol grip, allowing for intuitive and easy reloading in dark or difficult conditions, under the principle of “hand finds hand”.
The non-reciprocating charging handle on the top of the receiver cover is used to retract the bolt. Variants have a ratchet safety mechanism which will catch the bolt and lock its movement if it is retracted past the magazine, but not far enough to engage the sear.
When the handle is fully retracted to the rear, the bolt will cock (catch) on the sear mechanism and the handle and cover are released to spring fully forward under power of a small spring.
The cover will remain forward during firing since it does not reciprocate with the bolt.
The military and police versions will fire immediately upon chambering a cartridge as the Uzi is an open bolt weapon.
There are two external safety mechanisms on the UZI Caliber.
The first is the three-position selector lever located at the top of the grip and behind the trigger group.
The rear position is “S”, or “safe” (S = Sicher or Secure on the MP2), which locks the sear and prevents movement of the bolt.
The second external safety mechanism is the grip safety, which is located at the rear of the grip.
or firing pin holding mechanism (semi-auto) since the Uzi does not incorporate an internal cocking or hammer mechanism.
While the open-bolt system is mechanically simpler than a closed-bolt design (e.g. Heckler & Koch MP5), it creates a noticeable delay between when the trigger is pulled and when the gun fires.
Uzi with folding stock
While There are different stocks available for the UZI Caliber proper. The second had an angled butt and a straight comb and no hollows. The third had an angled butt and curved comb and no hollows; a polymer version is currently available from IMI. The wooden stocks originally had a quick-release base but the ones sold in the United States have a permanent base to be compliant with US gun laws.
Choate made an aftermarket polymer stock with a rubber buttpad that had a flat butt, a straight comb, and a permanent base.
In 1956, IMI developed a downward-folding twin-strut metal stock with two swiveling sections that tucks under the rear of the receiver. The Mini Uzi has a forward-folding single-strut metal stock that is actually an inch longer than the Uzi’s. The Micro UZI Caliber has a similar model.
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