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21 Cards in this Set
- Front
- Back
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What are the three types of semi-automatic actions?
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1. Blowback operated
2. Recoil 3. Gas |
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How does a Blowback action work?
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The action is not mechanically locked, and the weight of a heavy slide, plus a strong recoil spring is all that keeps the action closed.
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What happens upon firing?
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The chamber pressure created by cartridge ignition pushes the slide rearward, compressing the recoil spring.
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What exactly keeps the action closed?
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The inertia of the slide aided by spring resistance.
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Blowback designs are generally restricted to which type of pistols?
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Those firing low powered cartridges such as:
.22 LR, .25ACP .32 ACP and .380 auto. |
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How does Recoil action work?
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When the action is closed, the barrel is locked to the slide.
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What happens upon firing?
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The barrel and slide recoil rearward together for a distance before the barrel unlocks and allows the slide to travel further rearward to complete the cycle.
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What type of pistols employ recoil actions?
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Most self loading pistols with cartridges of the power of the 9mm Para or greater use this action.
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How does gas operated action work?
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High pressure propellent, gas is bled from the bore through a small hole in the barrel.
This will exert pressure on a piston or other component, driving it rearward to unlock the breech and work the action. |
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Most semi-automatic firearms utilize detachable box magazines. TRUE/FALSE
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TRUE.
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What are some advantages of box magazines?
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Rapid reloading
Large number of rounds can be fired in succession without reloading. |
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What component usually houses the cartridges?
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A steel, aluminum or plastic body.
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What is the floorplate?
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This is the floor of the magazine box. It can be removed to allow cleaning of the magazine.
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What is the function of the spring and follower?
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They help push the cartridges in the magazine upward into position for reliable feeding.
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What is a disconnector mechanism found in some semi automatic pistols?
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These require that the trigger be released and then repressed each time a shot is fired. This prevents the machine-gunning potential.
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What do single action semi automtics require?
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The hammer to be cocked manually for the first shot. The reciprocating slide cocks the hammer for all subsequent shots.
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What does double action employ?
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The first shot is fired with the hammer down in the double action mode, a long relatively long trigger pull both cocks and releases the hammer, and all following shots are fired in the single action mode.
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In semi-automatic safety mechanisms, the most familiar are the pivoting thumb levers located on the frame or slide. TRUE/FALSE
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TRUE. Some may located bilaterally for for ambidexterity.
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Safeties mounted on the frame typically block what?
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The sear. Those mounted on the slide usually prevent the hammer from contacting the firing pin.
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In cycle of operation, what is meant by 'in battery'?
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In the locking step, with blowback designs, no locking occurs. The momentum of the forward moving bolt or slide is sufficient to fully chamber a cartridge an close the action. Thaction at this point, is said to be in attery.
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Regarding semi-automatic cycle of operation, simply name the steps in the cycle.
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Firing
Unlocking Extraction Ejection Cocking Feeding Locking. |
