Base Ops Flashcards
What are the 8 cycles of function?
Feeding, chambering, locking, firing, unlocking, extracting, ejecting, cocking
What are the 3 feeding mechanisms?
Magazines
Belts
Clips
What are the three types of magazines?
Box (staggered and inline)
Drum
Pan
Type of belts used in machine guns ?
Split link Fully encased link Non-disintegrating link Disintegrating link S F N D
Two types of clips?
En-Bloc
Stripper clip
Five types of cartridges?
R, Sr, Rl, B, Re Rimmed Semi Rimmed Rimless Belted Rebated
Components of a cartridge?
Bullet, powder, case, primer
Five varieties of firing pins?
Free floating Inertia Percussion Striker Fixed (FIPSF)
3 ways firing pins receive their energy?
1. A larger mass strikes them Free floating 2. A spring provides their energy Inertia, percussion, striker 3. Their own mass provides their energy Fixed
Y
U
Inertia firing pin
Uses spring
M1911A1
USP
BHP
Percussion firing pin
Uses spring
M60, M2HB
Striker firing pin
A squeeze-cocking system is what compresses the firing pin
P7
Two types of primers?
Boxer
Berdan
Difference between boxer and berdan primers?
Boxer- one flash hole.
Anvil and flash powder built in
Berdan- two flash holes.
Contains only flash powder, the anvil is part of cartridge case, non-reloadable
What are the 8 Locking systems
Rotating bolt Rising/lowering bolt Swinging bolt Rising barrel Rotating barrel Locking block Locking flaps Roller
What are the Eight operating systems?
Bolt action Blowback Delayed blowback Recoil Recoil with gas assist Gas operation Manual pump Revolving cylinder
3 types of gas systems?
Gas blast
Gas tappet
Gas direct
Sifferent categories of ballistics?
Internal ballistics
External ballistics
Terminal ballistics
What is Battle sight?
The range that allows you to hit the target between the throat and waist without sight adjustment. Exact range varies with caliber of weapon.
What is the Breech?
The outside rear face of the barrel which meets the face of the bolt or breechblock
What is the Breechblock?
A componet that seals the breech and blocks gases from the fired cartridge. (Bolts in rifles, slides in pistols)
What is Compensator?
A device attached to the muzzle of a weapon designed to allow the gases following the bullet out of the muzzle to be deflected upward through slots in the top surface of the compensator. The lower portion of the compensator is solid, so that while some gas escapes through the top, gas is also pressing against the bottom.
What is a Disconnector
A device incorporated into the action of a weapon which prevents the firing of more than one shot for one pull of the trigger or which prevents the weapon from being fired until the action is fully closed
What is an Extractor
A component that engages the rim or extractor groove of the cartridge case while the cartridge is in the chamber.
Firing pin
The part of the firing mechanism that strikes or contacts the primer of the cartridge to cause ignition to fire the weapon
Flash suppressor
A three or four pronged device attached to the muzzle designed to cool the hot gases as it leaves the muzzle behind the round, cooling the gases reduces the flash
Headspace
The distance from the breechblock to that part of the chamber which stops the forward movement of the cartridge case
Muzzle break
A device at the muzzle end of the weapon which deflects the emerging powder gases. The energy imparted by this act of deflection pulls the weapon forward to offset some of the rearward motion of recoil
Muzzle flash
The incandescent flash in the air at the muzzle of the weapon which occurs when the bullet leave the barrel. This flash is caused by the expansion of the emerging powder gases, ignition of oxygen in the air and expulsion of burning powder grains
Muzzle velocity
The computed velocity in fps at which the bullet leaves the barrel
Primer
The small charge that is detonated by the firing pin, which in turn ignites the powder or propelling charge in the cartridge
Rifiling
A series of spiral grooves in the bore of a barrel which imparts a spinning motion to the bullet as it travels the length of the barrel from the breech to the muzzle
Sear
A component retained under spring tension that releases, by means of trigger, either a firing pin, hammer, or bolt
Trigger
A finger actuated lever used to activate the firing mechanism firing the weapon
Trigger bar
A connecting bar operating between the trigger and the sear. Nothing more than an extension of the trigger
Types of firing?
Single action SA Double action DA Semi Automatic Automatic Selective fire
Muzzle devices
Flash suppressors
Muzzle breaks
Compensators
Hybrids
What is an ejector?
A cam or projection inside the receiver against which the cartridge case strikes and is thrown clear of the mechanism after it has been drawn from the chamber by the extractor.
What does a fluted chamber do?
Uses to maximize energy for extraction, also leaves horizontal burn marks on cartridge case
3 types of trajectory?
Rising branch
Max ordinate
Falling branch
(Line of sight, trajectory, boreline)
Which operating system has no locking system?
Blowback
How do you measure a military cartridge?
Bullet diameter X Cartridge csse length
In millimeters
How do you measure a civilian caliber?
Across the bore measured from land-to-land in 1/100ths of an inch
Types of trajectories?
Rising branch
Falling branch
Max ordinate
Types of chokes in shotguns?
Full- tight narrow pattern
Modified- medium width
Improved cylinder- wide open spread
Cylinder- widest
