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| '''Carbine''' || 14.5 inches || Muzzle: Standard devices<br/>Bayonet compatibility: [[M9 bayonet]] || [[Colt M4]]<br/>[[Colt M4A1]] || '''300''' || Installs an M4 style 14.5 inch barrel, which provides a compromise between performance and weight. Considered to be the modern standard length for AR-15 platforms.
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| '''Sport''' || 14.5 inches || Muzzle: N/A || [[Alexander Arms AWS]] || '''100''' || Installs a featureless 14.5 inch barrel designed for sport and target shooting. Provides identical ballistic performance to the Carbine barrel but lacks muzzle threading and a bayonet lug.
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| '''Competition''' || 12.5 inches || Weapon becomes Class 2<br/>Muzzle: Standard devices || || '''600''' || Installs a short 12.5 inch barrel designed for competition shooting such as 3-gun.