FORS-2107EL Lecture Notes - Lecture 3: Red Bullet, Bolt Action, Pump Action
27 Jun 2018
School
Department
Course
Professor
Forensic Science - Day 3 2018.01.15.
Firearms and Toolmarks
Definitions
-Firearm: A firearm is any, assembly of a barrel and
action from which a projectiles is discharged by means
of a rapidly burning propellant
-Cartridge: Unit of ammunition consisting of the cartridge
case, primer, and propellant with or without one or more
projectiles
-Cartridge designation: An identifier created by the
manufacturer, which often includes the caliber of the
bullet and the name of the cartridge manufacturer
-Action: The part of the firearm that loads, fires, and ejects a cartridge
-Examples:
-Single action revolver
-Lever action
-Pump action
-Bolt action
-Semi-automatic
-Caliber: The diameter of a bullet
-Caliber is often expressed in hundredth of an inch
(USA and UK)
-A 22 caliber bullethas a diameter of 0.22 inches
-Caliber is also expressed in metric units (mm)
-The caliber of a bullet recovered from a crime scene
is a class characteristic
Anatomy of a Gun Shot
-When the trigger is pulled, the firing pin will probe the primer which will release hot
gases, and force, from the ignition reaction and will fire the bullet
Anatomy of a Semi-Automatic Pistol
-Ammunition is loaded into a magazine, which is inserted
through the underside of the grip
-Semi-automatic pistols can shoot multiple bullets by
consecutive trigger pulls
Anatomy of a Rifle
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Firearm: a rearm is any, assembly of a barrel and action from which a projectiles is discharged by means of a rapidly burning propellant. Cartridge: unit of ammunition consisting of the cartridge case, primer, and propellant with or without one or more projectiles. Cartridge designation: an identi er created by the manufacturer, which often includes the caliber of the bullet and the name of the cartridge manufacturer. Action: the part of the rearm that loads, res, and ejects a cartridge. Caliber is often expressed in hundredth of an inch (usa and uk) A 22 caliber bullethas a diameter of 0. 22 inches. Caliber is also expressed in metric units (mm) The caliber of a bullet recovered from a crime scene is a class characteristic. When the trigger is pulled, the ring pin will probe the primer which will release hot gases, and force, from the ignition reaction and will re the bullet.
