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Barrels Overview and Specifications

Main Menu > How the AR-15 Operates... > Barrels Overview & Specifications

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This video clip covers the parts and function of the barrel. Measurements and specifications are given for A1/pencil barrrels, medium diameter barrels and heavy or HBAR barrels. Barrel lengths, handguard lengths and types, and gas tube lengths are discussed. Muzzle breaks, flash hiders are discussed. Rate of twist and chambering of either .223 Remington and 5.56 NATO are discussed. Schematics and a view of the operation/interaction of parts are provided with a cutaway rifle. PDF instructions also available.

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WARNING: Never attempt to disassemble or reassemble a firearm unless you are absolutely certain that it is empty and unloaded. Visually inspect the chamber, the magazine and firing mechanism to be absolutely certain that no ammunition remains in the firearm. Disassembly and reassembly should follow the manufacturer’s instructions. By using this website and viewing this video you are subject to our Terms of Use.