The Definition of Snap Caps
Dummy cartridges with spring-loaded "primers" used to test the mechanical functioning of a firearm, particularly the trigger
pulls, hammer-fall and ejector-timing of a break-open gun. It is not advisable to dry-fire a break-open gun on an empty chamber.
Hardened steel parts can shatter without the soft brass primer to act as a shock absorber. Snap caps cushion the blow of the hammer and
firing-pin when the use of a live cartridge would be impractical.
19 Other Firearms Definitions You Need To Know
Failure of a spent case to completely eject from a semi-automatic firearm. The case usually stands on end while lodged in the ejection port.
A hammerless single shot action type whereby a breech-block, hinged at the upper rear, operated by an underlever, tilts downward to expose the chamber.
A catch built into the receiver of a break-open gun to keep the toplever in its extreme right position when the barrels are removed.
This device makes it slightly easier to remount the barrels. As the barrels are mounted and the breech closed,
the barrels contact some kind of release pin (marked with the arrow) and the toplever automatically returns
to the center locked position. Because, however, it requires a separate act to find and to depress this tiny
tab to re-center the toplever on a broken-down gun, this feature may be irritating when trying to put a gun away in its case.
A mechanical device to make it easier to fill magazines using less hand strength and without hurting one's fingertips or thumbs.
A laser sight is an alternative sighting device which enables the shooter to quickly and accurately see where the firearm is aimed even
when lighting or other conditions prevent using the gun's normal sights. Lasers may be located within the grips,
hung from accessory rails at the front end of the gun, or placed within the firearm.
A type of action used primarily for single shot rifles whereby some kind of lever actuates a breechblock, moving it downwards in a vertical recess to expose the chamber.
May have visible or enclosed hammer. For any given barrel length, it allows a shorter overall rifle length compared to a bolt action because no space is
taken up by the forward-and-back cycling of the bolt. Most of the better British makers produced them in limited numbers around the turn of the last century,
the Farquharson being the most iconic. Perhaps the best-known falling block action today is the Ruger No.1.
The earliest type of gun, now also popular as modern-made replicas, in which blackpowder and projectile(s) are
separately loaded in through the muzzle. The term is often applied to cap-and-ball revolvers where the loading is
done not actually through the muzzle but through the open ends of the cylinder's chambers.
The point of the trigger's return at which the gun's internal mechanisms are ready to fire another round.
In a handgun that does not have a hammer, the striker is a linear driven, spring loaded cylindrical part which strikes the primer of a chambered cartridge.
The striker replaces both the hammer and firing pin found in hammer driven pistols.
A firearm's ability to be fired fully automatically, semi-automatically or, in some cases, in burst-fire mode at the option of the firer.
A state of readiness of a firearm. The hammer (or similar mechanism if there is no hammer) only needs to be released by the trigger to cause the gun to fire.
The term referring to the action of manually drawing the hammer back against its spring until it becomes latched against the sear,
or sometimes the trigger itself, arming the hammer to be released by a subsequent pull of the trigger. Some external hammers, and all internal hammers,
may be cocked simply by pulling the trigger
A type of mechanism for removing a spent shell casing from the chamber of a firearm and inserting a fresh cartridge into the chamber.
This type of mechanism is most commonly used in shotguns and rimfire rifles.
The unplanned discharge of a firearm caused by a failure to observe the basic safety rules, not a mechanical failure of the gun.
Holding the trigger to the rear after the shot has fired, until the sights are back on target, at which time the trigger is released.
A plain, functional, unembellished firearm used to hunt in rough terrain where one might prefer not to put a more expensive, deluxe grade gun at risk of damage.
On a revolver, the collective ejector, manually operated through the center of an opened cylinder, when activated, clears all chambers at once.
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