Firearms & Toolmarks Review

Review of the Firearms and Toolmarks quiz

Which of the following is NOT a characteristic of a revolver?

a) the revolver uses a removable magazine.

b) it has several firing chambers within the revolver

c) it fires one shot per trigger pull

d) the cartridge cases remain in the cylinder after firing.

a) the revolver uses a removable magazine.

True or false? Shotguns have smooth barrels.

True

The name of the type of markings used to associate a bullet with a firearm are known as?

Striation marks

The caliber of a handgun is defined by the?

Diameter between lands

When viewing down the barrel of a handgun, what are the lands?

The raised areas that make physical contact with the bullet

What is the name of the microscope used when comparing two bullets?

Comparison microscope

Which of the following firearms ejects a cartridge on its own after firing?

A semi-automatic

Which of the following does not leave a marking on a cartridge case?

a) the breech face

b) the firing pin

c) the ejector

d) the primer

d) the primer

Which three elements are associated with gunshot residue?

Lead, antimony, and barium

What is indicated by a stellate pattern associated with a bullet hole?

A contact shot

The ability to estimate shooting distance from test firing patterns is based on the idea that when GSR leaves a handgun, it is dispersed in the form of a?

cone

As the distance between the firearm and the target increases, what happens to the diameter of the resulting GSR pattern?

The diameter increases as the distance increases.

Observation of a dense distribution of GSR particles on the target surface indicates?

The shooter/firearm was close to the target.

The name of the material found around the edges of a bullet hole is referred to as?

The bullet wipe

When a tool comes into contact with another object or surface, it can leave a tool mark in the form of what three things?

A gouge, a cut, an impression

True or false: It is by comparing and evaluating the class characteristics of a tool and its impression that we can begin to impart individuality to that tool.

False

True or false: When comparing a possible tool to a suspected tool mark, best practice is to attempt other fit the suspect tool directly into the mark ensuring flush contact to see if it fits properly, thereby establishing the match.

False

The shape of the firing pin can often be found impressed into the:

primer cap

Before submitting a firearm for analysis, it must first be rendered?

Safe