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Chart of Unsafe Firearms and Ammunition Combinations

 


 

Glossary Results

O - 22 matching terms

OBTURATION
The momentary expansion of a cartridge case against chamber walls which minimizes the rearward flow of gases between the case and the chamber wall when the cartridge is fired.

OFFSET MOUNT
See Mount, Offset.

OGIVE
The curved portion of a bullet forward of the bearing surface.

OGIVE, SECANT
A projectile nose with the curvature not tangent to the cylindrical bearing portion.

OIL-DENT
A defect in a brass cartridge case, usually in the form of a shallow indentation caused by excessive oil present in dies during case manufacture, or in re-sizing dies during handloading operations, or in a chamber during firing. Also called fluting.

OILPROOF
The treatment of a cartridge to minimize the entry of oil or water.

OPEN POINT
A type of bullet having a cavity in the tip or nose.

OPEN SIGHT
See Sight, Open.

OPEN-BREECH ACTION
See Action, Open-Breech.

OPERATING HANDLE
See Handle, Operating.

OPERATING LEVER
See Lever, Operating.

OPERATING SPRING
See Spring, Operating.

ORANGE PEEL
A rough textured finish similar to the skin of an orange, generally referring to certain stock finishes.

ORIFICE
A small hole or vent such as the gas port in the barrel of a gas-operated firearm.

ORIGIN OF THE TRAJECTORY
See Trajectory, Origin of.

OUT-OF-BATTERY
A firearm is said to be “out-of-battery” when the breeching mechanism is not in proper position for firing.

OUTSIDE LUBRICATED BULLET
See Bullet, Outside Lubricated.

OVER AND UNDER
Firearms with two barrels placed one above the other.

OVER-BORE
A shotgun whose barrel bore diameter is greater than the SAAMI maximum for that gauge.

OVER-BORE CAPACITY
A firearm chambered for a cartridge which contains more powder than can normally be burned in that bore diameter and volume.

OVERALL LENGTH
See Length, Overall.

OVERTRAVEL
The distance after a particular event occurs in the normal operation of the firearm, e.g. additional rearward motion of the trigger after sear or hammer release.

A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

Abbreviations:

A-L | M-Z