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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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