firearm and tools

define

100

A mark produced when one surface slides across another surface

Abrasion Mark

200

The projectile that is released when a firearm is discharged

Bullet

300

A mark or impression made by a tool on a softer surface

Indentation Mark –

define

100

The study of bullets and firearms

Ballistics 

200

The bore diameter of a rifled firearm, usually expressed in hundredths of an inch or millimeters – for example, .22 caliber or 9 millimeter

Caliber

300

The end of the barrel from which the projectile 

Muzzle

define

100

The long, metal tube that guides a projectile out of a firearm

Barrel

200

The process of determining the distance between the firearm and the target, usually based on the distribution of powder patterns or the spread of a shot pattern

Distance Determination 

300

 A pistol with a revolving cylinder

Revolver 

define

100

The interior of a barrel

Bore

200

The process of determining the distance between the firearm and the target, usually based on the distribution of powder patterns or the spread of a 

Distance Determination

300

 The spiral grooves etched into the bore of a firearm barrel that spin the projectile when it is fired

Rifling

define

100

The rear part of a barrel

Breechblock

200

The tiny particles expelled from a firearm when it is fired

Gunshot Residue (GSR) 

300

A pistol with a clip-fed mechanism that fires one shot per pull of the trigger; the empty cartridge ejects, and the next cartridge advances automatically

Semiautomatic