The Definition of Shell Casing
A hollow, piece of metal (or plastic in the case of a shotgun shell) that is closed on one end except for a small hole which holds a primer.
The open end holds the bullet. The hollow portion holds the powder.
Together the assembled unit is called a cartridge.
19 Other Firearms Definitions You Need To Know
The relationship between a bullet's weight and its diameter. A long bullet, such as the original 7.62x54R
loading for the Mosin Nagant 91/30, will have a high sectional density and consequently greater
penetration than a shorter bullet of similar construction. A shorter bullet with less sectional
density will have relatively less penetration, but greater knockdown power.
A firearm that can be separated into (at least) two subassemblies in order to make a shorter package than when put together, without tools.
There is no specific requirement regarding how this disassembly must be accomplished; the mechanical design is up to the creativity of the maker.
This arrangement allows for more convenient transportation of a firearm, but with rifles, where the action normally separates from the barrel, usually at a small sacrifice in accuracy.
Takedown firearms can also be called take-apart firearms.
Good examples of a takedown guns are the Henry AR-7 Survival Rifle, the Ruger 10/22 Takedown or the TNW Aero.
Racking the slide incorrectly by allowing your hand to rest upon the slide as it moves forward during the loading procedure. Riding the slide is a common cause of misfeeds and other malfunctions.
A locking device, usially a clable with a padlock that you put on a firearm to render it unable to be fired buy running it through the magazine well and out the ejection port.
The small dished container located on the side or top of a matchlock, wheel-lock or flintlock forearm used to hold the priming powder charge.
A premature, unintended discharge of a firearm that occurs as a round is being loaded into the chamber.
A firing mode enabling the shooter to fire a predetermined number of rounds with a single pull of the trigger.
An air gun that shoots a skirted pellet.
Most firearms do not have literal batteries. But a firearm is said to be in battery when the breech is fully closed and locked,
ready to fire. When the breech is open or unlocked, the gun is out of battery and no attempt should be made to fire it.
A semi-automatic is out of battery when the slide fails to come all the way forward again after the gun has fired, making it
dangerous or impossible to fire the next round. This condition can be created by a misfeed, a dirty gun, weak springs,
the shooter's thumbs brushing against the slide, riding the slide, or any of several other causes.
A person who can shoot up to the mechanical capability of their weapon.
A gun, typically artillery, with four barrels, such as the ZPU
The point of a projectile.
A type rimfire rifle cartridge developed by the ammunition company Hornady.
.17 Hornady Magnum Rimfire (4.5×27mmR), commonly known as the .17 HMR, was developed in 2002.
It descended from the .22 Magnum by necking down the .22 Magnum case to take a .17 caliber (4.5 mm) bullet.
Abbreviation for Double Action Only. Is a type of firearm in which the firing mechanism cannot be cocked in a single-action stage. Firing always occurs as a double-action sequence where pulling the trigger both cocks and then fires the gun.
On an outdoor shooting range, a large pile of dirt that functions as a backstop.
A military person designated as a special marksman who is used to shoot designated targets of opportunity at long range.
The tapered rear end of a bullet. This design is used to increase ballistic efficiency at long range.
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.
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