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Chapter 8 test

Terms in this set (35)

Firearms
A portable weapon that fires ammunition such as a pistol or rifle
Firearms Identification
a discipline mainly concerned with determining whether a bullet or cartridge was fired by a particular weapon
Ballistics
The study of projectile in motion.
What are the 3 major types of handguns?
-Single shot
-Revolver
-Semiautomatic
What is the difference between a single action and a double action revolver?
•Single action-the hammer has to be manually cocked backwards each time before the trigger is pulled in order to fire
•Double action-cock the hammer when the trigger is pulled and then reload the firing chamber after the round is fired
What are the characteristics of single shot pistols?
-can only fire one round or shot at a time
-each round must be manually loaded into the chamber before firing
What are the 3 types of revolvers? What is the difference between the 3?
•Swing out revolvers-cylinder swings out to the side
•Break top revolvers-both the barrel and cylinder flip downward for loading
•solid fram revolvers-small "gate" at the back of the gun allows one chamber to be loaded at a time
What are the characteristics of semiautomatic pistols?
•Contains a removable magazine that's often contained within the grip of a firearm
•Once magazine is loaded, the hammer is cocked by pulling the slide then released to load the first round
•Firing the cartridge generates gases that ejects the cartridge case
•Cock the hammer and load the next round
•Fires one shot per round
What are the two types of long guns? What is the difference between the two?
•Shotguns
-ammunition(shell) contains numerous ball-shaped projectiles(shot)
-Barrel: smooth, without grooves and lands found in rifles; shotguns narrow toward muzzles(choke)
•Rifles
-Semiautomatic: use the force of gas produce to during firing to eject the spent cartridge, load new round and cock the hammer; fire one shot per trigger
-Automatic: fire multiple consecutive shots with a single pull of the trigger
What is rifling? How and why does it occur?
The arrangement of spiral grooves on the inside of a firearm barrel; Rifling imparts spin to the bullet along the latter's lengthwise axis. This helps the bullet maintain a stable trajectory when it leaves the gun and enhances both the range and target accuracy of the gun.
What are the three rifling methods?
•Broach cutter
•Button process
•Mandrel Rifling or Hammer Forging Process
What are the major components of ammunition?
-Cartridge(unfired)
-Bullet
-Gun powder
-Cartridge case
-Primer
What are the class characteristics of a bullet?
-Caliber
-Direction of twist
-Number of lands and grooves
-Width of lands and grooves
-Type of rifling
-Mass
What are the individual characteristics of a bullet? How do these arise? What equipment is needed to determine individual characteristics?
•cross section of a gun barrel will show small grooves or striations along the lands and grooves (machine markings)
•Created when the barrel is rifled. No teo gun barrels have the exact same markings.
•These markings leave striations or impressions on a bullet. Allows a bullet to be traced back to a particular firearm.
•Can only be done with a comparison
•Width of the land and grooves must line up
•Striations within the grooves must match up
What are the sequence of events when a gun is fired?
•Pulling trigger releases firing pin
•Firing pin strikes the primer
•The powder is ignited
•The expanding gases ignited by the burning gun powder propel the bullet forward through the barrel
•The expanding gas also pushes the spent cartridge back
•The bullet is marked by the rifling in the barrel
•The spent cartridge is marked by the contact the metal surfaces of the weapons firing and loading mechanisms
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