Final Flashcards
Who was the first to testify using firearm identification?
Goddard
In what landmark case was there evidence tampering?
Sacco and Venzetti
Which of the following was the first to resemble modern rifles?
Matchlock
What gun was invented in response to the need for lightweight, handheld machine guns?
Browning Automatic Rifle
Which of the following guns used the same cartridge as the Winchester rifle?
Colt Peacemaker
What is the first known source of gross metal casting?
Sand molds
What type of fine forming leaves a concentric circle?
Turning
Which potential issue in test firing is caused by limp wristing?
When the cartridge fails to eject after firing?
Stovepipe
Which breechface pattern in usually associated with Glock?
Parallel
Which of the following is both a pinching and a gripping tool?
Lineman’s pliers
What type of visual analysis is associated with combinations of gas and smoke?
Carabonaceous material
Which of the following is used for magnetic surfaces in serial number restoration?
(Name) reagent
What type of obliteration is created by a round edge hit into the metal?
Hammer peening
Which rifle was the U.S. response to the Mauser rifle in the Spanish-American war?
Krag rifle
Which was the first person to create a database of firearms?
Charles E. Waite
Which firearm mechanism used a nitrate soaked cord lit on fire to ignite the primer?
Matchlock
Who wrote the first documentation that firearms leave individual marks?
Victor Balthazard
When producing cartridge cases the ____ stage adds height to the cartridge case.
Drawing
Which stage in the cycle of fire doesn’t leave any marks?
Extraction
Which is a passive safety?
Hammer block
What occurs after the obturation?
Unlock
Firing pin shape is not found on centerfire?
Rectangular
1st magazine fed rifle
Henry Rifle: tube magazine (lever action, breech loading)
How did the Winchester 1866 rifle correct the Henry rifle?
Winchester had a loading port and wood forestock, Henry had an easily jammed tube and made of iron (hot to hold)
Winchester 1873
centerfire
Colt Peacemaker
45 cal, same cartridge as Winchester rifle
first bolt action rifle, first true magazine (not tube) fed rifle
Mauser Rifle 1888, had stripper clip
Springfield rifle
almost identical to Mauser, with stripper clip, 30 cal, invented 1903
Browning 1911
originally 38, then 45, manufactured by Colt
1918, response to need for lightweight, handheld machine guns, trench warfare, Korean War and WWII
Browning Automatic Rifle (BAR)
Tommy Gun
1919: shot 45 auto instead of rifle
M1-Garand
1919-1932, semiauto, accurate + high rate of fire
1941, close combat rifle, small cartridge
M1 Carbine
MP44
1941, German response to M1 Carbine, 7.62X39 mm, first “assault rifle” via Hitler
AK 47
Russian, 7.62x39 mm, invented by Kalashnikov
1962, American assault rifle invented by Stoner, 5.56x45 mm, first to utilize plastics/polymers
M16
Mauser rifle
stripper clip, box magazine
Purposes of annealing
Refining the grain, Improving electrical and magnetic properties, Inducing softness, improve machinability
most semiautomatic pistols are ___ and ____
Blowback, short recoil
CNC
Computerized numerical control
Safety found on all pistols (?)
Slide disconnect
Chamber marks are most commonly found on ____
Small caliber bullets
Welding
Cannot usually restore SN
Brownsville 1906
Nixon overturns case because cartridges brought to police by citizens identified to a Krag or Springfield rifle. Conspiracy of silence.
Phelps/Wolcott 1915
Charlie Stielow, neighbor, lied about having a 22. Dr. Hamilton examines cases, Stielow put on death row, King and O’Connell confess to the murders, faulty firearms testimony. Class characterstics didn’t match.
Sacco/Vanzetti 1920
Were executed in 1927 for death of 2 guards and $15,000. Hamilton says bullets don’t match, Charles says they do.
EDM
Electrical discharge machining
St. Valentine’s Day Massacre
Goddard able to eliminate every cop’s gone. Al Capone responsible.
Constable Gutteridge 1927
fired CC found in stolen vehicle ID’d to firearm found on Kennedy/Browne.
lead/barium nitrate
The oxidizer
Ground borosilicate glass
adds friction, increases sensitivity
gum arabic/gum tragacanth
the binder
Sidewall thickness
CF thinner than RF
trimming
Cutting to correct dimensions, determines height, but not necessarily end height
Mouth annealing
CF
Relief annealing
RF
Annealing, pickling, washing
Done twice for RF
spinner bit
Needed in rimfire priming mixture
CF primer
Primer mix + foil disc + shellac and alcohol (to seal) + anvil (for fp to strike)
Primer seated too low
Primer may not ignite
Primer seated too high
Powder may not ignite, CC may bulge
Knurled cannelure
Found on revolver/rifle bullets b/c lubricant.
Crimped cannelure
On cartridge case to keep it all together.
