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2. Firearm malfunction - Wikipedia

   en.wikipedia.org/wiki/Firearm_malfunction

   Rim lock is where the rim of the shell casing gets caught on the extractor groove of the casing underneath it. It is a common issue for calibers with large rims, such as 7.62×54mmR , or guns that have been rechambered for cartridges shorter than intended without replacing the original magazine with one that compensates for the shorter round.

3. Extractor (firearms) - Wikipedia

   en.wikipedia.org/wiki/Extractor_(firearms)

   An extractor also performs the function of an ejector in revolvers. When the striking force applied to the ejector rod is hard and fast enough, the extractor will typically eject the empty case(s) from the cylinder. Some break-action shotguns are also designed to eject empty shells completely out of the chamber when the barrel is opened.

4. Action (firearms) - Wikipedia

   en.wikipedia.org/wiki/Action_(firearms)

   In pump action firearms, a sliding grip at the fore-end beneath the barrel is manually operated by the user to eject and chamber cartridges. Pump actions are predominantly found in shotguns . Some examples of firearms using the pump-action are the Winchester Model 1912 , Remington 870 , and Mossberg 500 .

5. Push feed and controlled feed - Wikipedia

   en.wikipedia.org/wiki/Push_feed_and_controlled_feed

   Most controlled feed mechanisms use a fixed mechanical ejector attached to the receiver, which results in the bolt having to be pulled all or almost all the way back to eject the spent casing. This can give a marginally quicker cyclic rate with a push feed action, since the bolt no longer has to be repeated as far or all the way back.

6. Vacuum ejector - Wikipedia

   en.wikipedia.org/wiki/Vacuum_Ejector

   A vacuum ejector, or simply ejector is a type of vacuum pump, which produces vacuum by means of the Venturi effect.. In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area.

7. Gas-operated reloading - Wikipedia

   en.wikipedia.org/wiki/Gas-operated_reloading

   Direct impingement operation increases the amount of heat that is deposited in the receiver while firing, which can burn off and cover up lubricants. The bolt, extractor, ejector, pins, and springs are also heated by the same high-temperature gas. These combined factors reduce service life of these parts, reliability, and mean time between ...

8. Break action - Wikipedia

   en.wikipedia.org/wiki/Break_action

   Since the cartridge extractor or ejector is built into the barrel assembly in break action weapons, the breech face is simply a flat plate with a hole for the firing pin to protrude through. This makes break actions ideal for interchangeable barrel firearms, such as the popular Thompson/Center Arms Contender and Encore pistols. The simplicity ...

9. Primary extraction - Wikipedia

   en.wikipedia.org/wiki/Primary_extraction

   The case is not chemically sticking as it still rotates with the bolt, gripped by the extractor claw on the rim. The mechanical sticking effect is a result from the case having expanded due to the high pressures during firing, and the extra initial force required can, depending on firearm design, make the extraction difficult for the user.