Basic Operations Small Arms Flashcards
8 steps in the cycle of operation
Feeding Chambering Locking Firing Unlocking Extracting Ejecting Cocking
5 types of cartridges
Rimmed Semi-rimmed Rimless Belted Rebated
5 varieties of firing pins
Free floating Inertia percussion Striker Fixed
2 types of primers
Boxer
Berdan
8 locking systems
Rotating bolt Rising/lowering bolt Roller Rising barrel Locking flaps Swinging bolt Locking block Rotating barrel
8 operating systems
Bolt action Blowback Delayed blowback Recoil Recoil with gas assist Gas operation Manual pump Revolving cylinder
Accelerator
A device that operates during rearward movement of the recoiling parts to increase the speed at which certain parts move. When the rate of the bolt or breechblock increases, the rate of fire increases
Accelerator
A device that operates during the rearward movement of the recoiling parts to increase the speed at which certain parts move. In general, when rate of movement of the bolt or breechblock is increased, the rate of fire is increased
Automatic
A weapon in which the first round is manually positioned in the chamber, or to be chambered, after the first round is fired, the empty case is ejected and the new round is chambered and fired. This action continues until the trigger is released or the ammo is expended.
Semi-automatic (auto-loading)
A weapon in which the first round is manually positioned in the chamber, or to be chambered. After the first round is fired, the casing is extracted and ejected and a new round is chambered, leaving the hammer or firing assembly in the cocked position for the next round. The trigger must be released after each shot and pressure reapplies to fire the next round.
Ballistics
The science and study of the motion and impact of projectiles
Internal ballistics
The science of projectile motion within a firearm. It is most simply all that happens with in a firearm from the instant the primer ignited until the bullet leaves the barrel.
External ballistics
Concerns the path of the bullet from the muzzle to the target
Terminal ballistics
Concerns what happens to the bullet after it hits the target and what the bullet actually does to the target upon impact.
Battle sight
Range that allows you to hit the target between the throat and waist with out sight adjustments. Exact range varies with caliber of weapon.
Barrel
Portion of weapon through which a projectile is propelled by action of the gases generated by the burning propellant charge.
Bolt
A major component of a firearm whose main function is to support the base of the cartridge and seal the chamber when the cartridge is fired, the bolt may contain other sub assemblies such as firing pin, locking lugs, extractor, and ejector. The bolt generally moves forward and backward in the receiver in a motio lomgtudinal to the axis of the bore. During the forward movement of the bolt the cartridge is chambered and the chamber odds sealed by the face of the bolt. During the rearward movement the fired cartridge is extracted from the chamber and ejected from the receiver. The bolt is also referred to as the breechblock.
Bolt carrier
A component of the firing mechanism that carried the bolt and which usually contains grooves cans or lugs that assist in locking the bolt forward position during firing. Manual unlocking of bolt is often accomplished by moving the bolt carrier through an attached handle.
Bolt handle
A handle or projection attached to the bolt that can be grasped in order to manually open or close the bolt
Breech
The outside rear v face of the barrel which meets the face of the bolt of breechblock
Breechblock
A component that seals the breach and blocks gases from the fired cartridge
Buffer
A part intended to absorb the shock of moving parts of check the motion of major components during recoil and our counter-recoil
Bushing
A detachable Metal lining commonly used around certain parts to provide a better fit than be accomplished by direct machining.
Caliber
Distance across the bore of a weapon measured from land to land expressed in hundreds of an inch
Cannelure
An invented ring or groove around a bullet into which the cartridge case is roll crimped to keep the bullet firmly attached to the car
