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36 Cards in this Set

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All firearms fundamentally take the form of a tube known as a what?
Barrel.
What is a typical chemical propellent?
Gunpowder.
The projectile is the bullet.
How is the bullet projected?
When gunpowder is ignited, there is creation of a hot and high pressure gas, which forces the projectile out of the open end of the barrel at high velocity.
What did muzzle loading involve?
The gunpowder and then the projectile were put into the barrel from the open or muzzle end of the barrel.
With respect to muzzle loading, how is loading performed today?
The powder and bullet are combined into a single unit, called a metallic cartridge, which has as well a pressure sensitive component referred to as a primer or priming compound. This compound ignites the powder.
All pistols that fire metallic cartridges are breech loading firearms. TRUE/FALSE
TRUE. This is a firearm in which the cartridge is loaded into the rear of the barrel, or breech.
What are three major components of breech loading pistols?
Frame, barrel and action.
What does the action determine?
How the gun operates, and is the collection of parts that serve to fire the gun.
Action components are involved in loading a cartridge, closing and or locking the breech. TRUE/FALSE
TRUE. It is also involved in cocking the hammer or striker, and extracting and/or ejecting the fired caseload.
Virtually all pistol actions have 1 or more safety mechanisms. TRUE/FALSE
TRUE.
Specific action types have a variety of components to close and/lock the breech. Give some examples.
A slide in semiautomatic pistols:
Bolt in bolt action pistols.
In revolvers, the breech is closed not by a separate component, but by a part of the frame called the recoil shield.
What else do revolver actions include?
The cylinder, which has chambers that hold the cartridges, and for cylinder rotation.
What is considered the central component of most pistols?
It is the FRAME.
What is attached to the Frame?
The stocks or grips and the barrel(s).
What are modern pistol frames made of?
Steel, aluminun, titanium and more commonly, polymer materials.
In most pistols, the barrel is usually made of what?
Steel.
What is the bore?
The hole or size(lumen) of it, that projects through the barrel.
What is meant by "spiral rifling?
The bore has spiral rifling. This spins the bullet for stability and accuracy.
How is rifling formed?
It is formed by creating shallow grooves in the bore surface. The slightly raised areas between the grooves are called "Lands."
What forms at thr rear of the bore?
It forms chambers, which accept particular cartridges.
What is the forward end called?
The muzzle.
How long do some pistol barrels vary?
2-15".
The Trigger is aterm used to denote what?
The entire mechanism that releases the part of the action(usually a hammer or a striker)) that causes the cartridge to be ignited.
What happens with single action firearms?
The trigger directly releases the cocked hammer when it is pulled.
How might other trigger mechanisms differ?
The trigger releases the spring loaded hammer, firing pin or striker through an intermediary mechanism such as a "sear or trigger bar".
In general, firearm safety mechanisms are of two types. What are they?
Active and Passive.
Define active safety mechanism.
These mechanisms must be intentionally activated and deactivated by the shooter.
Define passive.
The mechanism functions more or less automaticly.
Most commonly, active safety mechanisms take what form?
They take the form of a lever, sliding button, that can manually be moved to a safe position to prevent firing as well as a "fire" position permitting the gun to be discharged.
What form(s) might passive mechanisms assume?
Grip safety, that prevents firing unless the gun is properly gripped.
Others might prevent the hammer from contacting the firing pin, or the firing pin from contacting the cartridge, unless the trigger has been pulled fully rearward.
What is a decocking mechanism?
Found in many double action semi-automatics, these serve to drop the cocked hammer to the down position.
In conventional and semi automatic pistols, how is the breech closed and locked?
By a component called a slide.
This rides on horizontal rails in the frame
What about breech closing or locking mechanisms in revolvers?
They have no separate mechanism. Behind the cylinder is a flat face in the frame, called the "recoil shield". This supports the head of the cartridge in the chamber that is aligned with the firing pin and the barrel.
What are the seven steps of the cycle of operation?
1. Firing
2. Unlocking
3. Extraction
4. Ejection
5.Cocking
6. Feeding
7. Locking
What is extraction?
The pulling of the spent cartridge case rearward out of the chamber, usually by a part called an extractor.
What is ejection?
The forcible throwing of the spent case clear of the action by a component called the ejector.