Rifiling
The spiral pattern of lands and grooves in the barrel of a firearm
Ejector
the mechanism in a firearm that throws the cartridge or fired case from the firearm
Striations
stripes
bore
to drill a hole
Extractor
the mechanism in a firearm by which a cartridge of a fired case is withdrawn from the chamber
barrel
the long, metal tube that guides a projectile out of a firearm
Lands
The raised areas between two grooves in the rifling of a gun barrel that impart grooves on the bullet. Metal between grooves
residue
whatever is left after a part is taken, disposed of, or gone; remainder; rest
shell
payload-carrying projectile that, as opposed to shot, contains an explosive or other filling
Grooves
The spiral grooves cut or swaged inside a gun barrel that gives the bullet a spinning motion
Breechblock
the rear part of a firearm barrel
cartridge
a case that holds a bullet, primer powder, and gunpowder. Includes shell and bullet.
caliber
is a measurement of the diameter of the bullet or the bore. Used for handguns and rifles
gauge
defines the number of solid balls the same diameter as the inside of the barrel that could be made from a pound of lead. Used in shotguns
Tool mark
discipline of forensic science which has as its primary concern to determine if a toolmark was produced by a particular tool. Figure out where it is manufactured
bullet wipe
If a firearm has been fired more than 3 feet from a target, usually no residue is deposited, but a dark ring, k