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Glossary Results

M - 75 matching terms

MACHINE GUN
1. A fully automatic firearm that loads, fires and ejects continuously when the trigger is held to the rear until the ammunition is exhausted or pressure on the trigger is released.
2. To Machine Gun: See Full Automatic, Runaway. Also known as Firing Full-Automatic.

MACHINE REST
Mechanical apparatus used for holding a firearm in a precisely controlled, selected position for testing the accuracy of the ammunition or the firearm.

MAGAZINE
1. A building for the storage of either ammunition or its components.
2. A recepticle for a firearm that holds a plurality of cartridges or shells under spring pressure preparatory for feeding into the chamber. Magazines take many forms, such as box, drum, rotary, tubular, etc. and may be fixed or removable.

MAGAZINE CATCH
The device that retains or releases the magazine in a firearm. Also known as Magazine Latch or Magazine Release.

MAGAZINE FED
A repeating firearm in which the ammunition for subsequent firing is fed from a magazine.

MAGAZINE FOLLOWER
A spring-actuated device to move cartridges in a magazine into the feeding position.

MAGAZINE LOCK
See Magazine Catch.

MAGAZINE PLUG
1. A part inserted in a magazine to reduce its capacity.
2. A part in the end of a tubular magazine which closes the end and retains the spring.

MAGAZINE SPRING
The spring in a magazine that exerts its thrust against the follower.

MAGAZINE, BLIND BOX
A magazine having a permanently closed bottom. Loading and unloading are accomplished through the same opening.

MAGAZINE, BOX
A rectangular recepticle attached to or inserted into a firearm that holds cartridges stacked on top of one another ready for feeding into the chamber.

MAGAZINE, MANNLICHER
A type of rotary magazine.

MAGAZINE, ROTARY
A form of magazine in which the cartridges are arranged about a central rotating spindle or carrier. See also Magazine, Mannlicher.

MAGAZINE, TUBE BRACKET
See Barrel Guide.

MAGAZINE, TUBULAR
A metal tube that contains cartridges or shells end to end.

MAGNUM
A term commonly used to describe a rimfire or centerfire cartridge, or shotshell, that is larger, contains more shot or produces higher velocity than standard cartridges or shells of a given caliber, or gauge. Rifles, handguns or shotguns that are designed to fire Magnum cartridges or shells may also be described with the term Magnum.

MAINSPRING
The mechanical, energy storage device that operates the striker or hammer of a firearm.

MALFUNCTION
Failure of a firearm to perform properly due either to the firearm or the ammunition.

MANN “V” REST
See Rest, Mann “V”.

MANN BARREL
See Barrel, Mann.

MARK, M, MK
A term used in conjunction with a number to designate a specific model or type of firearm or ammunition.

MARKINGS
Words or symbols, stamped, rolled, cast or engraved, on a firearm designating the manufacturer, model, origin, caliber or gauge, choke, material, etc.

MASTER EYE
The eye that controls both eyes when pointing toward or picking out an object. sometimes called the dominant eye.

MATCH AMMUNITION
See Ammunition, Match.

MATTE, MATTE FINISH
A dull non-reflecting metallic surface.

MAXI BALL
An elongated, heavy weight bullet, usually incorporating annular exterior grooves to hold lubricant.. Designed to be loaded and fired without a patch, it’s major diameter being slightly larger than bore diameter causing engraving by the rifling upon loading.

MAXIMUM CHARGE
See Charge, Maximum.

MAXIMUM RANGE
See Range, Maximum.

MEAN RADIUS
See Radius, Mean.

MEPLAT
A term for the blunt tip of a bullet, specifically the tip’s diameter.

METAL CASED BULLET
See Bullet, Full Metal Jacket.

METAL FOULING
Metallic bullet material left in the bore after firing.

METAL PATCHED BULLET
See Bullet, Metal Cased.

METALLIC AMMUNITION
See Ammunition, Metallic.

METALLIC SIGHT
See Sight, Metallic.

METFORD RIFLING SYSTEM
A form of rifling with shallow grooves that are arcs of less than half of the groove diameter.

MICROMETER POWDER MEASURE
An adjustable, volumetric device for measuring propellant powders.

MICROMETER SIGHT
See Sight, Micrometer.

MID-RANGE
1. A term that defines a specific point in the trajectory of a projectile that is half the distance between the firearm and the target.
2. A reduced velocity, centerfire cartridge, used principally in target shooting.

MID-RANGE TRAJECTORY
See Trajectory, Mid-Range.

MIDDLE SIGHT
See Sight, Middle.

MIL
The angle subtended by one unit at 1000 units.

MINIE BALL
A conical nosed lead bullet, slightly under bore diameter, incorporating a hollow base, designed to expand into the rifled bore upon firing for gas sealing purposes without the use of a patch.

MINUTE OF ANGLE (M.O.A.)
An angular measurement method used to describe accuracy capability. A minute of angle is one sixtieth of a degree, and subtends 1.047 inches at 100 yards, which for practical shooting purposes is considered to be one inch. A minute of angle group, therefore, equals one inch at 100 yards, two inches at 200 yards, etc.

MIRAGE
A visual phenomenon that appears to displace a target from its true position through a shimmering effect. It is caused by heated air that deflects light rays.

MISFEED
Any malfunction during the feed cycle of a repeating firearm resulting in the failure of a cartridge or shell to enter the chamber completely. Also known as Failure to Feed.

MISFIRE
A failure of the priming mixture to be initiated after the primer has been struck an adequate blow by a firing-pin or the failure of the initiated primer to ignite the powder.

MONOBLOC
The solid section at the breech end of some multi-barrel guns into which the barrels are inserted.

MONTE CARLO
See Stock, Monte Carlo.

MOUNT
See specific type.

MOUNT, OFFSET
A mount for telescopes or iron sights affixed to the gun in such a manner, that the line of sight is to the side and above the receiver or barrel.

MOUNT, TELESCOPE
A device to hold a telescope on a firearm.

MOUNT, TUNNEL
A telescope mount arrangement which has a hollowed-out base through which the iron sights may be seen and used.

MOUNT, TWO-PIECE
A telescope mount having two separate base band ring assemblies.

MOUTH
The open end of a cartridge case or shotshell, from which the projectile or shot charge is expelled in firing.

MOUTH PULL-DOWN
If a bullet is incorrectly inserted into the mouth of a case, it may deform the case mouth rearward, downward, causing a defect called mouth pull-down.

MULLERING TOOL
A type of checkering tool.

MULTIPLE LEAF SIGHT
See Sight, Multiple Leaf.

MUSHROOM
A descriptive term for a soft point, hollow point or special type of bullet point that is designed to expand to increased sectional diameter.

MUSHROOMING
The act of expansion of a bullet upon impact with a target.

MUSKET
Military firearm with long barrel and fore-end or forearm extending nearly to muzzle.

MUSKET CAP
The ignition source for most military muzzle loading rifles of the Civil War era, usually consisting of a copper alloy cup containing the priming mix. They are larger than percussion caps and typically incorporate a continuous or segmented flanges (Wings) at the cup mouth for ease of handling.

MUZZLE
The end of a gun barrel from which the bullet or shot emerges.

MUZZLE –BREAK
An electrical or optical device which signals the passage of shot or a projectile at the muzzle of a firearm.

MUZZLE BLAST
The resultant noise that occurs at the muzzle of a firearm when the projectile leaves the muzzle and hot gases are released.

MUZZLE CAP
A cover put on the muzzle end of a barrel to keep out foreign matter.

MUZZLE CROWN
See Crown.

MUZZLE ENERGY
A projectile’s energy at the time it leaves the muzzle of a gun.

MUZZLE FLASH
The illumination which is the result of the expanding gases from the burning propellant particles emerging from the barrel behind the projectile and uniting with oxygen in the air.

MUZZLE GUARD
A device put on the end of a barrel with a hole concentric with the bore to admit a cleaning rod and keep the rod from wearing the rifling in this critical area. Not used on guns cleaned from the breech end.

MUZZLE JUMP
The generally upward motion of the muzzle of a firearm which occurs upon firing.

MUZZLE VELOCITY
The velocity of a projectile as it exits the muzzle of a firearm.

MUZZLE WAVE
The air that is compressed and moves out radially from the muzzle of a firearm after firing a projectile.

MUZZLE-BRAKE
Device at the muzzle end usually integral with the barrel that uses the emerging gas behind a projectile to reduce recoil. See also, Compensator.

MUZZLELOADER
Firearm which can only be loaded with powder and projectile(s) through the muzzle or front end of a cylinder in the case of a muzzleloading revolver.

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Abbreviations:

A-L | M-Z