AR-15 Calibers

Commercial AR-15 caliber, SAAMI specification

AR-15 caliber designed for long-range performance

A low-cost rimfire cartridge commonly used for high-volume practice and fundamentals.

**Best fit:** training-focused setups, recoil-sensitive shooters, and economical range sessions.

**Build notes:** often run through dedicated .22 LR uppers or conversion kits, with reliability varying by ammo and setup.

Compact rimfire cartridge with very light recoil

Rimfire magnum cartridge with higher velocity than .22 LR

6mm cartridge based on the .308 Winchester case

6.5mm cartridge based on the .308 Winchester case

Classic full-length rifle cartridge for hunting and service rifle history

Subsonic and supersonic AR-15 caliber, designed for suppressed use

Commercial AR-10 caliber, SAAMI specification

Low-recoil revolver target cartridge

AR-15 straight-wall hunting caliber

Magnum revolver cartridge also used in some carbines

Compact pistol cartridge for blowback PCC systems

Revolver cartridge occasionally used in PCC platforms

Pistol cartridge used in some AR-9 and Glock-compatible PCC builds

Magnum revolver cartridge for high-energy hunting roles

AR-15 straight-wall cartridge for hunting

Large-bore AR-15 caliber for close-range power

Pistol caliber carbine for AR-15 platform

Intermediate AK cartridge known for mild recoil and flat trajectory

Standard AR-15 caliber, NATO military specification

AR-10 caliber optimized for long-range precision

AR-15 caliber optimized for long-range accuracy

Magnum 6.5mm cartridge focused on higher velocity

6.8x43mm Special Purpose Cartridge for AR-15

AR-15 caliber for precision and hunting

Necked-down Creedmoor cartridge for high-BC 6mm projectiles

Intermediate cartridge used by AK-pattern rifles and some AR-15 builds

Standard AR-10 caliber, NATO military specification

Pistol caliber carbine for AR-15 platform