The Definition of Group
A set of holes in a target left by a succession of bullets fired from the same rifle or handgun,
using the same ammunition and sight setting. Fired (within the limits of one's marksmanship ability)
to determine the inherent accuracy of the rifle/ammunition combination,
and to aid in the proper adjustment of the sights.
19 Other Firearms Definitions You Need To Know
A 1/60th part of a degree, the unit of measure used in adjusting rifle sights.
As it turns out conveniently, a minute of angle translates almost exactly to one inch at 100 yards
(actually 1.047 inches), to two inches at 200 yards and three inches at 300 yards
Expanding 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.
Covered compartment in the buttstock of a rifle used to carry patches or other small items.
Firearms which are of special interest to collectors by reason of some quality
other than is associated with firearms intended for sporting use or as offensive or
defensive weapons. To be recognized as curios or relics, firearms must fall within one of
the following categories:
A special Curios or Relics license is available from the BATF, which allows collectors to buy eligible firearms in interstate commerce.
- Firearms which were manufactured at least 50 years prior to the current date, but not
including replicas thereof;
- Firearms which are certified by the curator of a municipal, State, or Federal museum
which exhibits firearms to be curios or relics of museum interest; and
- Any other firearms which derive a substantial part of their monetary value from the fact
that they are novel, rare, bizarre, or because of their association with some historical
figure, period, or event. Proof of qualification of a particular firearm under this
category may be established by evidence of present value and evidence that like firearms
are not available except as collector's items, or that the value of like firearms
available in ordinary channels is substantially less.
The steel skeleton of the forend (above), into which any moving parts are fitted and which mates to and revolves about the action knuckle when the gun is opened.
A complete cartridge of several obsolete types and of today's rimfire and center-fire versions
Abbreviation for Concealed Carry Permit.
A gun holder that may be strapped to a human body, or affixed to the inside of a pack or bag, or dropped into a pocket.
A holster serves to protect the gun's mechanisms and finish, to provide security by covering the trigger so it cannot be pulled inadvertently,
and to present the grip of the gun at a constant angle for easy access. Some holsters also serve to obscure the outline of the
gun so it may be more easily concealed. Typically made from leather or in plastic.
In any mechanism, a small lever that engages a notch to actuate movement in one direction only.
Specifically, a small spring-loaded lever attached to the hammer of a revolver which actuates the cylinder to advance one
increment and move the next chamber into battery as the hammer is cocked.
A type of firearms magazine that is cylindrical in shape, similar to a drum.
Probably the most recognizable drum magazine is the magazine for a Thompson carbine rifle, also known as the Tommy Gun.
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.
The second article in the United States Bill of Rights which states,
"A well regulated militia being necessary for a free state, the right of the people to keep and bear arms shall not be infringed."
To shoot while standing and without bracing against anything. Sometimes it can also mean to shoot with your non-dominant hand.
Also spelled blueing.
A passivation process in which steel is partially protected against rust, and is named after the blue-black appearance of the resulting protective finish.
True gun bluing is an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite
(Fe3O4), the black oxide of iron, which occupies the same volume as metallic iron. Bluing is most commonly used by gun manufacturers, gunsmiths and gun
owners to improve the cosmetic appearance of, and provide a measure of corrosion resistance to, their firearms.
A trigger that breaks (to release the hammer) easy.
The wearing away of a barrel's metal surface by a bullet or shot charge or by the heat of powder gases.
A rifle with a relatively short barrel.
Helical grooves in the barrel of a gun or firearm, which imparts a spin to a projectile around its long axis.
This spin serves to gyroscopically stabilize the projectile, improving its aerodynamic stability and accuracy.
Also known as Gun Powder.
A mixture of sulfur, charcoal, and potassium nitrate. It burns rapidly, producing a volume of hot gas made up of carbon dioxide, water, and nitrogen, and a solid residue of potassium sulfide.
Because of its burning properties and the amount of heat and gas volume that it generates, gunpowder has been widely used as a propellant in firearms and as a
pyrotechnic composition in fireworks.
Modern firearms do not use the traditional black powder described here, but instead use smokeless powder.