The units of measure for quantity of ammunition is rounds. A single unit of ammunition in modern firearms is called a cartridge. Usually one lever on each side of the firearm.ĪMMUNITION – The “packaged” components that are needed in order to fire in a case or shell holding a primer, (which produces the spark) a charge of propellant (gunpowder) and a projectile (bullets, slug or pellets.) Sometimes called “fixed ammunition” to differentiate from the individual components placed separately in muzzleloaders. Examples: BB gun, pellet gun, CO2 gun.ĪMBIDEXTEROUS SAFETY – A manual, external safety which can be easily reached with either hand. Adjustable triggers are common on specialized target-shooting firearms, but rare on self defense firearms.ĪIRGUN – Not a firearm but a gun that uses compressed air or CO2 to propel a projectile. An adjustable stock is one that can be easily lengthened or shortened to fit shooters of different sizes.ĪDJUSTABLE TRIGGER – A trigger that can be easily adjusted by the user. Compare with Negligent Discharge.ĪDJUSTABLE STOCK – The stock is the wooden, polymer, or metal handle of a long gun that extends from the trigger back to where the gun is braced against the shoulder. There are very, very few firearms related “accidents” and if the “4 Rules” are followed there will hopefully be no injury. 25 ACPĪCTION – The working mechanism of a firearm involved with presenting the cartridge for firing, and in removing the spent casing and introducing a fresh cartridge.ĪCCIDENTAL DISCHARGE – An unexpected and undesirable discharge of a firearm caused by circumstances beyond the control of the participant(s) such as a mechanical failure or parts breakage. Automatic Colt Pistol, a type of ammunition. It is commonly used to designate specific calibers, particularly those which were originally designed by John Moses Browning for the Colt Firearms Company. Republished with permission from The Well Armed WomanĮver wanted to know the meaning of a term used in the world of firearms? You shouldn’t have to look any further than the comprehensive list below.ĪCP – An abbreviation meaning: Automatic Colt Pistol.

Gun jam types