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Aftermarket: n. A part/component that did not come with the original equipment, but was bought separately. (As opposed to stock.)

Agitator: n. A hopper which contains a small battery operated motor connected to paddles which act to move paintballs into the feeder of a paintgun. This gives the gun a constant supply of paintballs without requiring that the gun be rocked back and forth to force the ammunition to feed. Some sort of agitator is generally needed to be able to sustain a high rate of fire from a paintgun.

Airball, (v.) : A type of tournament play in which the bunkers on the field are inflated.

Airsmith: A person who repairs or customizes markers; often has special training.

Air Source Adapter: n. Also ASA. The threaded socket on a paintgun to which a propellant tank is attached.

Allen Wrench: A small L-haped 6-sided tool. Used in paintball to change the marker’s velocity and to take the marker apart for cleaning.

Aluminium: n. A light elemental metal. Aluminum alloys are commonly used in the manufacture of paintball guns, accessories and tanks. Aluminum is notable for its relative lightness and resistance to corrosion. It is a soft metal, and easy to shape. This means that aluminum parts are inexpensive but also susceptible to impact damage.

Anodization: v. A process for coating metals, during which the object’s surface is hardened and can be colored. The object to be coated is placed in a solution containing metallic salts and an electric current is passed through it.

Anodizing: 1. v. To anodize. 2. n. The stylistic properties of a paintgun or other object caused by anodization. Most often used to refer to an attractive color scheme.

Anti-fog Spray: n. A spray designed for preventing the lenses of glasses or paintball goggles from fogging.

Anti-Syphon: n. A small curved tube built internally into some CO2 tanks to prevent liquid CO2 from entering the paintball gun. CO2 should ideally enter the paintgun only in a gaseous state, as liquid CO2 can lead to velocity inconsistencies or even damage the paintgun.

Arm Band: A colored cloth or tape worn around players’ arms to distinguish teams from each other. Players in walk-on games, scenarios, and big games typically use armbands.

Artifact: An object (such as a "treasure chest") that is worth points, usually used in scenario games.

ASA: n. Acronym for Air Source Adapter. The threaded socket on a paintgun to which a propellant tank is attached.

Auto-Trigger: n. A feature on some pump-action paintguns allowing the user can hold down the trigger while pumping the gun. Each time the gun is pumped it then fires automatically without pulling the trigger again.