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37 Cards in this Set
- Front
- Back
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Interior of a firearm barrel |
Bore |
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The rear part of a firearm barrel |
Breach face m the diameter of the boar of a rifle the firearm usually expressed in hundredths of an inch or millimeters ark |
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The diameter of the bore of a rifle firearm usually expressed in hundredths of an inch or millimeters |
Caliber |
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Interior construction placed at or near the muzzle end of a shotgun barrel to control shot dispersion |
Choke |
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The process of determining the distance between the firearm in a target, usually based on the distribution of powder patterns, or the spread of a shotgun pattern |
Distance, determination |
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The mechanism in a fire arm that throws the cartridge or fired case from the firearm |
Ejector |
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The mechanism in a firearm by which a cartridge or fired case is withdrawn from the chamber |
Extractor |
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Discipline mainly concerned with determining whether a bullet or cartridge was fired by a particular weapon |
Firearms identification |
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Size designation of a shotgun originally the number of lead balls with the same diameter as the barrel that would make a pound |
Gauge |
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A chemical test used to develop the patterns of gunpowder residue’s around bullet holes |
Greiss test |
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The cut or low lying portions between the lands in a rifle bore |
Grooves |
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The raised portion between the grooves in a rifle bore |
Lands |
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The spiral groups formed in the boar of a firearm barrel that impart spin to the projectile when it’s fired |
Rifling |
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What are the three most common types of handguns? |
Single shot, revolver, and semi automatics |
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The revolver features several firing Chambers where are they located? |
A rotating cylinder |
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The barrel of a shotgun |
Is smooth without the groups and lands found in rifles |
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What is the reason that groups are rifled into the bore of a gun? |
The bullet will be made to spin and thus have a true and accurate course on leaving the barrel. |
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The comparison of two bullets is possible with a comparison microscope such a comparison is made difficult by what fact |
Lands in groups are subject to wear and tear and head striation markings are susceptible to continuing change, the presence of grit and rest can to some degree alter the markings on bullets fired through the same barrel, often evidence bullets are distorted on impact, and only small areas are found with intact markings |
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Generally, the gauge of a shotgun is what is the diameter of its barrel? |
Directly related |
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What can make distinctive markings on shells and cartridges? |
Breech face mark, extractor and ejector mechanism, and magazine |
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What are IBISes? |
Automated screening tools for firearm evidence |
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Generally speaking the amount of gun powder particles found around a butt hole is what to the amount of distance from which the weapon was fired |
Inversely related |
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Gunpowder residue patterns can be detected by what |
Greiss test and infrared photograph |
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Chokes are sometimes found on shotguns to constrict. The end of the barrel speed and distance traveled by pallets, fired from a narrow choke is, what’s the speed and distance traveled by pellets, fired from a shotgun with a wide choke |
Greater than |
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The dermal nitrate test has fallen into disfavor because of his lack of specificity, which of the following common materials is not one of the substances that give a misleading positive reaction to this test |
Chocolate |
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Caliber is a measure of the diameter of the bore of a rifle firearm |
True |
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The hook cutter rifling method is still used today |
False |
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The number of lands and grooves in the width and direction of twist are individual characteristics of a rifle barrel |
False |
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It is important to closely match the optical characteristics of the objective lens in a comparison microscope |
True |
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Unlike handguns, a shotgun is not rifled |
True |
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Shotgun shells are not impressed with any characteristic markings that can be used to compare to shotgun shells to determine whether they were fired from the same weapon |
True |
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The parts of a fire on that we’ve impressions on a cartridge case that constitute class characteristics of that weapon are the firing pin the breach face mark the ejector, and the extractor |
False |
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NIBIN is the international integrated ballistics information Nettwerk, a unified fire arm search system that incorporates both DRUGFIRE and IBIS technologies |
True |
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NIBIN makes the final determination about whether to bullets were fired by the same gun |
False |
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A distance determination can be estimated by measuring the spread of the discharge shot |
True |
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As the distance to the target of a shotgun, blast decreases the pellet separate and spread out |
False |
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Shortly after a weapon is fired residues are most likely to be deposited on the thumb web in the back of the firing hand of a shooter |
True |
