Firearm
Differences
Differences
Collection of
Firearms
Firearms
Bullet
Characteristics
Characteristics
Pin Marks
100
What do shotguns shoot?
Shot shells
100
What guns have rifling in their barrels?
Handguns and rifles
100
What do the miniature green balls represent?
Gun Powder
100
What is the purpose of the firing pin?
It strikes the primer, igniting the gunpowder, causing the ammunition to fly down the barrel.
200
Fill in the missing word of this sentence: "The _________ the caliber, the larger the gun."
Higher
200
You find a gun in the ocean. How do you submit it to be analyzed?
It should be rinsed and well oiled and submitted as soon as possible.
200
What do the large green balls represent on this shot shell?
Shot pellets
200
What is the purpose of the extractor?
The extractor grips the cartridge case after it is fired, and pulls it into position to exit the gun.
300
What are twisted grooves carved into the barrel of a gun?
Rifling
300
What tool allows CSI to see two bullets, or two cartridge cases at one time?
The comparison microscope
300
What part of the firearm strikes the primer, igniting the gunpowder, causing the ammunition to fly down the barrel?
The firing pin
300
What is the purpose of the ejector?
The ejector forces the empty casing out of the gun.
400
What gun could this cross section of a barrel represent?
A Handgun or Rifle
400
What type of weapon and projectile is this statement referring to:
"The explosion pushes the wad and shot pellets out of the casing and down the barrel of the gun. Pellets spread out after leaving the barrel."
Shotgun shotshell
400
What are the lines on this bullet called?
Rifling Striations
400
What type of Breech Face Mark is this?
Circular
500
Which type of gun lacks (does not have) grooves and lands?
Shotguns
500
The Firearms Division deals with guns while also examining what 2 things?
Tool marks and explosives
500
List at least 2 characteristics of bullets and casings:
- Brand / Manufacture
- Bullet weight, shape and size
- Information on the headstamp of the cartridge
- Caliber / gauge of the ammunition
- The type of material used to make the ammunition
500
What are the two types of guns that create these pin marks?
Rim fire and Center fire guns
1000
What part of a gun is being shown in this picture?
The Ejector
1000
What is this image showing?
Comparison of extractor marks under a microscope
1000
What (other than the cartridge and bullet) leaves the gun after it is fired that can be very useful evidence?
burned/unburned gunpowder and primer particles
1000
True or False:
A negative GSR test indicates the suspect did not recently fire the gun.
False