Gun Parts

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Barrel
provides a path for the fired bullet; its chamber holds the cartridge
Bolt
contains the firing pin, spring, and extractor (internal part) [AR-15]
Bolt Lock Lever
holds the bolt to the rear when the charging handle is pulled to the rear and the lower portion is depressed; releases the bolt when the upper portion is depressed
Buffer (Spring)
enables the bolt to return after firing (internal part)
Butt
the end of the stock
Chamber
supports the cartridge at rest and during firing (internal part)
Charging Handle
enables manipulation of the bolt to chamber a round
Ejection Port
opening that permits the shell to exit the weapon (internal part)
Ejector
expels the shell from the ejection port (internal part of the bolt)
Extractor
grips and pulls the shell from the chamber
Forestock / Hand Guard
used to support the rifle with the support hand; acts as a heat shield from the barrel
Forward Assist
a button assuring that the bolt is locked
Lower Receiver Group
contains the magazine release, magazine well, trigger housing, and trigger components [AR-15]
Magazine
contains ammunition ready to be chambered
Magazine Release
permits removal of the magazine from the firearm [AR-15]
Magazine Well
housing for the magazine (internal part)
Muzzle Flash Suppressor
attachment on the barrel's forward end that reduces the flash as burning powder escapes when the bullet exits the barrel
Safety
blocks the hammer from striking the firing pin; prevents firing (located on the left side of the weapon)
sights (front and rear)
used to align the firearm to the bullet's point of impact
Sling Swivels
metal loops affixed to the rifle/carbine to which a carrying strap attaches
Stock
part that enables shoulder support during firing
Take Down Pins
enables separation of the upper receiver from the lower receiver and allows for fieldstripping and cleaning
Trigger
enables the firearm to fire when pulled
Trigger Group
section consisting of the trigger, trigger springs, safety, and all firing mechanism parts
Trigger Guard
part of the frame that protects the trigger
Upper Receiver Group
houses the bolt assembly group
Slide Release (Action)
mechanical device that, when activated, releases the slide [Shotgun]
Barrel
long cylinder-shaped tube through which the projectile travels from the chamber
Bolt
cylindrical steel part containing the firing pin and extractor, which closes the breech end of the barrel for firing
Bolt Carrier
flat steel part that fits onto the action bars and on which the bolt sits
Ejection Port
opening on the side or bottom of the receiver; spent casings are ejected from it and live rounds are loaded into this port
Ejector
piece of spring steel mounted on the inside left of the receiver; when the action pulls a shell to the rear, it compresses and then releases the ___ as the bolt goes past it
Extractor
metal hook-shaped part mounted on the bolt; the hook engages the rim of the cartridge so that when the action is brought to the rear, the ___ removes the shell from the chamber.
Fore-end (Slide)
wooden or polymer grip near the magazine
Front Sight (Bead Sight)
bead or raised post on the front of the barrel used to bring the firearm into alignment for accuracy
Loading Port
bottom opening on the receiver that live rounds are fed into or removed from the magazine tube
Magazine Cap
located on the magazine tube's end and keeps the barrel in place
Magazine Tube
located under the barrel and holds rounds
Muzzle
barrel's front end
Rear Sight
secondary aligning device located on the receiver or barrel that aligns with the front sight bead or post to bring the shotgun into alignment for accuracy
Receiver
holds the trigger group and bolt assembly [Shotgun]
Safety
mechanical device that prevents a shooter from pulling the trigger and discharging the shotgun
Shell Carrier
slightly rounded steel part that blocks the loading port; catches rounds released from the magazine and raises them into alignment with the chamber
Shell Latches (stops)
two pieces of steel mounted on each side of the inside of the receiver at the magazine's rear; they help hold the cartridges in the magazine and release them one at a time when the action operates. They are also used to manually unload the shotgun.
Stock
part of the weapon attached to the receiver; a shooter places the ___ on his or her shoulder when firing
Butt
rear area of the stock that the shooter mounts against the shoulder for firing; normally covered with a metal or plastic ___ plate or a recoil pad
Comb
stock's top edge where the shooter's cheek rests
Grip
"small of the stock," just behind the receiver; the shooter uses the ___ and his or her shooting hand for control when firing or carrying it
Heel
top corner of the butt
Recoil Pad
a butt plate, usually rubber, that reduces the effect of the shotgun's recoil or "kick"
Toe
the bottom part of the butt
Trigger
when pulled, this releases the sear (a part that holds the hammer in the cocked position) and activates the firing pin
Trigger Guard
part of the frame that protects the trigger
Accessory Rail
provides space for lighting and sighting devices
Back Strap
portion of the grip that is placed in the palm of the shooting hand
Frame
holds the internal parts, as well as the slide assembly, and provides a way to grip the pistol
Receiver
holds the internal parts, as well as the slide assembly, and provides a way to grip the pistol
Front Sight
located on the slide's front; used to bring the firearm into alignment for accuracy
Front Strap
portion of the grip that allows the fingers of the shooting hand to rest
Grip Panel
made of polymer designed to allow the shooter to easily grip and control the weapon
Magazine Catch
releases the magazine from the frame (magazine well) [Pistol]
Magazine Floor Plate
base of the magazine
Muzzle Barrel
provides a path for the fired bullet and is chambered to hold the cartridge [Pistol]
Rear Sight
located on the rear of the slide that aligns with the front sight to bring the firearm into alignment for accuracy
Slide
houses the firing pin, safety, drop safety, sights, and extractor
Slide Cover Plate
allows access of the firing pin assembly
Slide Lock
device that allows quick and simple field stripping of the pistol
Slide Stop Lever
device that locks the slide in the open position
Thumb Rest
place for the thumb to rest while gripping the pistol
Trigger
activates the pistol's operation
Trigger Guard
part of the frame that protects the trigger
Trigger Safety
allows the trigger to move when pressed [Pistol]
Recoil Guide
directs the recoil spring
Recoil Spring
pushes the slide forward
Backstrap
portion of the grip that is placed in the palm of the shooting hand
Barrel
provides a path for the fired bullet
Center Pin
on a Smith & Wesson revolver, it is the spring-loaded part that holds the cylinder closed
Crane
attaches the cylinder to the frame so the cylinder can swing in and out of the frame opening; Colt uses the term ___; Smith & Wesson uses the term YOKE (internal part)
Cylinder
houses the extractor rod and contains the chambers that hold the cartridges
Cylinder Release Latch
disengages the cylinder from the frame
Cylinder Stop
locks the cylinder
Extractor
star-shaped device attached to the extractor rod that fits inside the cylinder that the rounds rest on (internal part)
Extractor Rod
when depressed, it causes the extractor to push the cartridge from the cylinder
Frame
internal structure that holds the parts of the revolver and provides a way of gripping the firearm
Front Sight
located on the end of the barrel near the muzzle; it is designed for the swift location of the target and for bringing the firearm into alignment for accuracy
Grip
made of wood, plastic, or rubber; designed to allow the shooter to grip the firearm easily for control
Hammer
when the trigger is pulled, this part falls forward to activate the primer
Hammer Nose / Firing Pin / Pin
part of the hammer or frame that protrudes through the frame and strikes the primer (internal part)
Hammer Spur
part of the hammer used for cocking the weapon to single-action mode
Hand
part of a revolver that turns the cylinder as the gun is cocked, thus aligning a cartridge with the hammer or firing pin (internal part)
Rear Sight
located on the rear of the frame; it can be adjustable or fixed
Top Strap
part of the frame that houses the rear sight, positioned over cylinder
Trigger
activates the revolver's operation in both single and double action
Trigger Guard
part of the frame that protects the trigger
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