The Definition of Double Action
An action type that when the trigger of a gun is pulled, the gun gets cocked and the hammer (or striker) is dropped.
This applies to both revolvers and semi-automatic guns.
On a double action revolver, when the trigger is pulled, the hammer is cocked before releasing.
With a double-action semi-automatic pistol, the hammer does not have to be manually cocked (via actually pulling back the trigger or tracking the slide), the hammer (or striker) will be cocked while the trigger is being pulled.
A firearm that only the hammer drops when the trigger is pulled is a single action gun.
19 Other Firearms Definitions You Need To Know
There are a lot of different competitions and other games which involve firearms. These are all referred to collectively as the shooting sports.
Some triggers can be pulled slightly backwards before the shooter can feel any tension and before
the hammer or striker begins to retract. Pre-travel is any movement of the trigger that begins before the trigger starts to engage.
A type of firearm which, utilizing some of the recoil or some of the expanding-gas energy from the firing cartridge,
cycles the action to eject the spent shell, to chamber a fresh one from a magazine, to cock the mainspring and to fire again.
Such a firearm will fire continuously as long as the trigger is held back, until the magazine is empty. A machine gun.
A firearm thus activated, but which shoots only one bullet with each separate pull of the trigger,
while often erroneously referred to as "automatic" is properly termed Semi-Automatic.
A small single-shot or multi-barreled pocket pistol. Derringers (spelled with two Rs) are called that because of the original desinger and anmufactuturer of that
type of gun, Henry Deringer. To get around copyright infringment other designers and manufacturers spell the name with two Rs.
A heat-treating process that incorporates carbon into the surface molecular
structure of the steel, providing a hard-wearing surface without making the entire
receiver brittle. The parts to be casehardened are packed in a crucible with
carbon-rich media such as bone meal and charcoal, heated to bright orange, about
1800°F, then quenched in bubbling oil. Also
An imaginary line which runs right down the center of the handgun's barrel and out though the back end of the gun.
A handgun may have a high bore axis, with the imaginary line running out into space well above the shooter's hand.
Or it may have a low bore axis, with the imaginary line running either straight through the shooter's hand or
just skimming the surface slightly above her hand. A high bore axis tends to create greater perceived recoil
and more muzzle flip when firing the gun than does a low bore axis.
Shrinking the neck of an existing cartridge to make it use a bullet of a different caliber. A typical process used in the creation of wildcat cartridges.
The tunnel down the barrel of a firearm through which the projectiles travel.
- A smooth-bore firearm is one that does not have rifling on the barrel's internal surface.
- A big-bore firearm is one that fires a large caliber.
- A small-bore firearm is one that fires a small caliber.
The single projectile expelled from a gun. It is not the same as a cartridge, the cartridge is complete package,
which includes the case, primer, powder, and bullet, which is called or a round. Bullets can be of many materials, shapes,
weights and constructions such as solid lead, lead with a jacket of harder metal, round-nosed, flat-nosed, hollow-pointed, etc.
A highly sensitive explosive used as a primer compound.
An inexact, non-technical term indicating a magazine holding more rounds than might be considered "average.".
A line, either imaginary or marked, from which people shoot their firearms down range.
The opening in the bottom of the gun into which a box magazine is fed. On a semi-auto handgun,
the magazine well is at the base of the grip; on a rifle, it is usually placed in front of the trigger guard.
A rifle projectile made with the tip of the bullet open as a means of increasing accuracy as
compared to standard military bullets that are made with a closed tip and an open base.
The are not designed to expand like a hollow point bullet but may fragment.
The assembly consisting of a bullet, gunpowder, shell casing, and primer.
Cartridges also include shotgun shells and black powder packets used in muzzle loading guns.
Short, interchangeable cylinders, of
subtly different internal tapers, that screw into a threaded recess at the muzzle of a
shotgun. By inserting different choke tubes, one can alter the shot pattern thrown by the
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