Ballistic/ Gunshot Residue

2. A unit of measurement for the internal diameter of a shotgun barrel.
6. The spiral pattern of lands and grooves inside a barrel that spins a bullet as it travels.
8. A measure of the diameter of a cartridge in hundredths of an inch, or the internal diameter of a firearm barrel.
9. The mechanism in a firearm that throws a spent casing out of the gun after firing.
10. Block The metal block that closes the rear end of a firearm's barrel during firing.
11. The raised surfaces between the grooves inside a barrel.
13. The recessed channels cut inside a barrel that help form the rifling pattern.
14. The bullet or object that is propelled out of the barrel of a gun when fired.

1. Microscopic scratches left on a bullet by a barrel's rifling, used by examiners to match a bullet to a specific gun.
3. The mechanism in a firearm that pulls a spent casing or cartridge out of the chamber.
4. Determination The forensic process of estimating how far a firearm's muzzle was from a target based on gunshot residue patterns.
5. Identification A branch of forensic science that examines bullets, cartridge cases, and rifling patterns to link ammunition to a specific firearm.
7. Test A chemical test that detects nitrite residues from gunshot residue on evidence to help determine muzzle distance.
8. A constriction at the muzzle end of a shotgun barrel that controls the spread of the shot.
12. The hollow interior of a firearm's barrel through which the bullet travels.