- AR: Armalite
- The “A” in A1, A2, etc: Alternation #
- Carbine: Shortened version of a rifle
- CQB: Close Quarters Battle
- CQC: Close Quarters Combat
- Hi-Cap: High Capacity
- Mag: Magazine
- Mil-Spec AR15 The United States Defense Standard is often called a Military Standard, “MIL-STD”, “MIL-SPEC” or “MilSpec”
– An AR15 designed to U.S. Department of Defense standards - NV: Night Vision
- Picatinny Rail Interface System
- SOPMOD: Special Operations Peculiar Modification
- SPR: Special Purpose Rifle
- Caliber: Measurement of the inside diameter of the barrel of a firearm. Caliber may be measured in hundredths of an inch (e.g., .45 caliber), but may also be measured in millimeters (e.g., 9mm).
- Cartridge: A round of ammunition that includes primer, gunpowder, and explosive cap to ignite the powder, gun casing , and the bullet
- Automatic vs Select-Fire
– Full Auto = many rounds per pull of the trigger
– Burst Fire = two or three rounds per pull of the trigger
– Semi-Automatic = one round per pull of the trigger
– Selective Fire (Select Fire) = semiautomatic and automatic
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