The Definition of Toplever
A lever on a break-open gun mounted to the top of the receiver which, when pushed with the thumb (normally) to the right, operates (usually) a
Scott Spindle, which in turn withdraws (usually) a Purdey Underbolt from the bites in the lumps of the barrels,
allowing them to hinge downwards and the gun to open.
19 Other Firearms Definitions You Need To Know
A firearm is loaded when a cartridge is in its firing chamber. However, for safety reasons all firearms are always treated as loaded at all times.
Abbreviation for Concealed Firearms License.
Bull barrels are barrels that are not tapered at all. These very heavy barrels, designed for extreme accuracy, are usually seen on target rifles.
The amount of propellant powder that is suitable for specific cartridge-bullet combination,
or in the case of shotshells, for a specific weight of shot and wad column.
A fired case has marks upon it that it picked up from the extractor, ejector, and breechface of the gun when the shot went off.
A bullet fired through a rifled barrel also has rifling marks unique to the barrel that launched it. A record of these marks, when stored in a central database,
is called a ballistic fingerprint. Some states require this record to be made by law, so that individual guns can be located from bullets or casings found at the scene of a crime.
A cartridge with a metallic case. (Early cartridge cases were made of linen, paper, etc.)
A safety catch fitted to a hammer gun where a sliding bar moves into a slot in the inner wall of the hammer base, locking it in place in the cocked position.
The safety can then be released silently by sliding the tab, avoiding the game-startling sound of the hammer cocking.
An action type that when the trigger is pulled, the only thing the trigger does is drop the hammer (or striker).
This applies to both revolvers, semi-automatic and automatic guns.
On a single action revolver, the gun must be manually cocked before it can be fired.
With semi-automatic and automatic guns that are single action, the only thing the trigger does is drop the hammer, striker or firing pin onto the cartridge.
Then the firearm is cocked again when from the recoil of the fired round.
A firearm that the gun is cocked and the hammer drops when the trigger is pulled is a double action gun.
A unit of weight widely used to express the weight of bullets and of powder charges. Equal to 1/7000 pound.
A type of small arms ammunition that eliminates the cartridge case that typically holds the primer, propellant, and projectile together as a unit.
A matrix of dots, posts or lines, visible inside a rifle's telescopic sight, normally adjustable via exterior knobs for windage and elevation.
After careful adjustment at a known range, the shooter aims the rifle by superimposing this matrix onto the target. With good estimation or range,
cooperation from the wind, a clear eye and a steady hand, he may have a reasonable expectation of hitting his target.
A steel bolt, mounted transversely through a rifle stock just under and behind the front (and sometimes rear) receiver ring,
sometimes concealed in the wood and usually against which the action is carefully bedded. When properly fitted, it helps distribute the recoil
and reinforces stock at the point where wood has been removed to accept the action. Recoil crossbolts can be recognized by the
flush-mounted circular steel fittings on the side of the stock, but are sometimes finished with contrasting wooden plugs and
sometimes concealed completely. Also called Reinforcing Crossbolt.
A specialized firearm used underwater that is fired when in direct contact with the target.
The setting on the sights used to accommodate the wind or adjust for horizontal (side-to-side) errors in the alignment of the sights with the bore of the firearm.
This is the maximum overall length the cartridge can be (and is expected to be) in order to function properly in magazines and the mag well of a bolt action rifle.
The vise-like device on a flintlock hammer used to hold the flint.
A firearm manufactured by someone who is not a regular maker of firearms.
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