AR-15 Calibers

Browse calibers compatible with AR-15 platform rifles and find components for your build.

10mm Auto

0.4" bullet ar-9
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12 Gauge

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16 Gauge

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.177 Caliber

0.177" bullet
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.17 HMR

0.172" bullet
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.17 Remington

0.172" bullet ar-15
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.204 Ruger

0.204" bullet
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.22-250 Rem

.22-250 Remington

0.224" bullet
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.222 Rem

.222 Remington

0.224" bullet
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.223 Remington

Commercial AR-15 caliber, SAAMI specification

0.224" bullet ar-15
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.224 Valkyrie

AR-15 caliber designed for long-range performance

0.224" bullet ar-15
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.22 ARC

0.224" bullet ar-15
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22 Creedmoor

0.224" bullet ar-10
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.22 Hornet

0.224" bullet
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.22 LR

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.
0.223" bullet ar-15
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22 Nosler

0.224" bullet ar-15
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.22 Short

Compact rimfire cartridge with very light recoil

0.223" bullet
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.22 WMR

Rimfire magnum cartridge with higher velocity than .22 LR

0.224" bullet ar-15
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.243 Win

.243 Winchester

6mm cartridge based on the .308 Winchester case

0.243" bullet ar-10
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.25-06 Rem

.25-06 Remington

0.257" bullet
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.25-45 Sharps

0.257" bullet ar-15
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.25 ACP

0.251" bullet
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25 Creedmoor

0.257" bullet ar-10
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.260 Rem

.260 Remington

6.5mm cartridge based on the .308 Winchester case

0.264" bullet ar-10
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.270 Win

.270 Winchester

0.277" bullet
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.277 Fury

.277 SIG Fury

0.277" bullet ar-10
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.284 Winchester

0.284" bullet ar-10
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.30-06 Sprg

.30-06 Springfield

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

0.308" bullet
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.300 AAC Blackout

.300 Blackout

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

0.308" bullet ar-15
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.300 HAM'R

0.308" bullet ar-15
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.300 PRC

0.308" bullet
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.300 Win Mag

0.308" bullet
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.300 WSM

0.308" bullet
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.30-30 Win

.30-30 Winchester

0.308" bullet
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.308 Winchester

Commercial AR-10 caliber, SAAMI specification

0.308" bullet ar-10
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.30 Carbine

0.308" bullet ar-15
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.30 Luger

0.309" bullet ar-15
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.32 S&W Long

Low-recoil revolver target cartridge

0.312" bullet
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.338 ARC

0.338" bullet ar-15
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.338 Federal

0.338" bullet ar-10
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.338 Lapua

.338 Lapua Magnum

0.338" bullet
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.338 Spectre

0.338" bullet ar-15
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.338 Win Mag

0.338" bullet
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.350 Legend

AR-15 straight-wall hunting caliber

0.357" bullet ar-15
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.357 Magnum

Magnum revolver cartridge also used in some carbines

0.357" bullet
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.357 SIG

0.355" bullet glock-compatible
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.358 Winchester

0.358" bullet ar-10
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360 Buckhammer

.360 Buckhammer

0.358" bullet ar-15
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.375 H&H

.375 H&H Magnum

0.375" bullet
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.380 ACP

Compact pistol cartridge for blowback PCC systems

0.355" bullet glock-compatible
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.38 Special

Revolver cartridge occasionally used in PCC platforms

0.357" bullet
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.38 Super

0.356" bullet
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.400 Legend

0.4" bullet ar-15
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.40 S&W

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

0.4" bullet ar-9
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.410 Bore

0.41" bullet
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.44 Magnum

Magnum revolver cartridge for high-energy hunting roles

0.429" bullet
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.44 Special

0.429" bullet
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.450 Bushmaster

AR-15 straight-wall cartridge for hunting

0.452" bullet ar-15
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.454 Casull

0.452" bullet
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.45-70 Govt

.45-70 Government

0.458" bullet
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.458 SOCOM

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

0.458" bullet ar-15
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.45 ACP

Pistol caliber carbine for AR-15 platform

0.451" bullet ar-15
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.45 Colt

0.452" bullet
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.45 GAP

0.451" bullet glock-compatible
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4.6x30mm HK

0.183" bullet
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.50 AE

0.5" bullet
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.50 Beowulf

0.5" bullet ar-15
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5.45x39mm

Intermediate AK cartridge known for mild recoil and flat trajectory

0.221" bullet ak
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5.56x45mm NATO

5.56 NATO

Standard AR-15 caliber, NATO military specification

0.224" bullet ar-15
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5.7x28mm

0.224" bullet
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6.5 Creedmoor

AR-10 caliber optimized for long-range precision

0.264" bullet ar-10
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6.5 Grendel

AR-15 caliber optimized for long-range accuracy

0.264" bullet ar-15
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6.5 PRC

Magnum 6.5mm cartridge focused on higher velocity

0.264" bullet ar-10
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6.8 SPC

6.8x43mm Special Purpose Cartridge for AR-15

0.277" bullet ar-15
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6mm ARC

AR-15 caliber for precision and hunting

0.243" bullet ar-15
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6mm Creedmoor

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

0.243" bullet ar-10
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6mm MAX

0.243" bullet ar-15
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7.62x25 Tokarev

7.62x25mm Tokarev

0.308" bullet
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7.62x39mm

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

0.311" bullet ak
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7.62x51mm NATO

7.62 NATO

Standard AR-10 caliber, NATO military specification

0.308" bullet ar-10
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7mm-08 Rem

7mm-08 Remington

0.284" bullet ar-10
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7mm PRC

0.284" bullet
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7mm Rem Mag

7mm Remington Magnum

0.284" bullet
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8.6 BLK

8.6 Blackout

0.338" bullet ar-10
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9mm Luger

9mm

Pistol caliber carbine for AR-15 platform

0.355" bullet ar-9
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9x39mm

9x39

0.364" bullet ar-15
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