The Definition of Expanding Bullet
An expanding bullet is a bullet designed to expand on impact, increasing in diameter to limit penetration and/or produce a larger diameter wound.
The two typical designs are the hollow point bullet and the soft point bullet.
See also Dum-Dum Bullet
19 Other Firearms Definitions You Need To Know
The manner in which the sights are lined up properly in front of the shooter's eye, to form a straight path to the target.
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.
A type of lock in which the hammer pivots in a vertical arc, striking the nipple on the underside of the barrel.
Since the nipple's flash channel goes straight into the powder at the breech end of the barrel, ignition time is very fast.
For this reason, and because it gets the hammer out of the way, underhammer locks are commonly used on muzzleloading
benchrest rifles which are used for target shooting, and where accuracy is the goal.
To jerk a firearm off target inadvertently in the instant of firing in timid anticipation of recoil. Commonly caused by learning to shoot with a gun more powerful then they are ready for.
The amount of change in the bore axis, measured both vertically and horizontally, while the projectile moves from the chamber to the muzzle when it is fired.
AK stands for Avtomat Kalashnikova (Kalashnikov rifle when translated into English).
When someone says "an AK" they are usually referring to the AK-47 rifle which was originally designed in Russia by Mikhail Kalashnikov.
In the rifling of a bore, the uncut portions of the barrel's inner surface left after the rifling grooves have been cut into the metal. In other words, the raised portion of rifling.
Firearm Owners' Protection Act of 1986. It is a United States federal law that revised many provisions of the Gun Control Act of 1968.
It bans civilian ownership of machine guns manufactured after May 19, 1986. Firearms made and registered before that date are not affected.
The law limits the Bureau of Alcohol, Tobacco and Firearms
from inspecting gun dealers more than once a year, with follow-up inspections allowed only
The law also specifically forbids the government from creating a national registry of gun ownership.
An external, manual safety which is typically disengaged with the firing-hand thumb.
A sidelock action where the mainspring is mounted rearward towards the butt.
The back action is often used in double rifles where the need for strength requires as
little steel as possible be removed from the bar of the action.
The heading of a bullet, used in external ballistics that refers to how the Magnus effect causes bullets to move out of a straight line based on their spin.
Two shots fired very quickly with the use of the sights.
A strong spring which activates the striker or hammer of a firearm.
The proper adjustment of the various interrelated moving parts of a gun so that every operation works in proper sequence, such as that the two ejectors
of a double gun kick out the spent cases at the same instant and with the same force.
Unloading a gun and double checking that it is unloaded or fixing a malfunction so that the gun is ready to fire again.
Typically used in the .22 caliber cartridge designation .22 Long Rifle, which is abbreviated .22LR.
A rear barrel sight base, more articulated than having the sight simply dovetailed into the barrel, but not requiring as much gunsmithing as having it mounted onto a proper quarter-rib.