20 MOA Base

Canted scope base adding built-in elevation for long-range dialing.

3-Gun

Multigun competition using rifle

Action

The mechanism that loads, fires, and ejects cartridges.

Adjustable Gas Block

Gas block with a metering screw to tune gas flow.

Annealing

Heating case necks to restore ductility and extend case life.

AR-10

A larger-frame AR platform typically chambered in .308-class cartridges.

AR-15

A modular, semi-automatic rifle platform typically chambered in intermediate cartridges.

Arca Rail

A dovetail mounting standard allowing quick repositioning of supports.

Baffles

Internal suppressor structures that slow and cool gas flow.

Bag Rider

A flat surface on the stock or butt to better interface with a rear bag.

Ball Powder

Spherical propellant granules offering good flow in measures.

Ballistic Coefficient

A measure of a projectile's ability to overcome air resistance in flight. Higher BC values indicate better aerodynamic efficiency and less trajectory drop over distance.

1 related term

Barrel

A rifled tube that guides the bullet and imparts spin.

Barricade Shooting

Engaging targets from improvised or positional supports such as barricades

Belted Magnum

Cartridges with a belt near the base for headspacing strength.

Benchrest

Discipline focused on extreme precision from a bench using front and rear rests.

Berdan Primer

Primer type with two anvil holes; cases are harder to reload.

Biathlon

Skiing and rifle marksmanship combined in a timed event.

Bipod

Two-legged support attached to the fore-end for stability.

Boat Tail

Tapered base of a bullet reducing drag.

Bolt

The component that locks into battery, supports the case, and extracts and ejects.

Bolt Carrier Group (BCG)

Assembly including carrier

Bolt Lugs

Protrusions that lock the bolt into the action to contain pressure.

Bolt Stop

A device that locks the bolt to the rear or stops its travel.

Bolt-Action Rifle

A manually operated rifle where the bolt is cycled by hand to load and extract cartridges.