The spiral pattern cut into the bore consists of raised areas called __________ and depressions called __________.
Drag and drop the terms onto the image to label the schematic of a bullet.

Explain why GSR cannot be used to connect a suspect to a weapon used in commission of a crime.
Count how many lands/grooves are shown on each barrel cross-section!

Categorize the following breechface impression!
Categorize the bullets as left twist or right twist.
LEFT
RIGHT
Label the cartridge casings as centerfire or rimfire.

Examine the following bullet and note its dimensions:
- 6 lands/grooves
- cut rifling
- groove width = 0.037 - 0.041 inches
- land width = 0.188 - 0.190 inches
Check the "show your work" section and select all of the possible firearm manufacturers from the list below: