AR Platform Caliber Compatibility List


#1

Just some useful information on what Calibers work with each platform.

AR-15 PLATFORM

Centerfire calibers inch measurement

.17 Remington
.17×223
.204 Ruger
.223 Remington - .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges will produce excessive pressure in a .223 rifle.
.223 Remington Ackley Improved
.243 Winchester Super Short Magnum
.25 Winchester Super Short Magnum
.25-45 Sharps
.270AR
.277 Wolverine (6.8×39mm)
.30 Carbine
.30 Herrett (.308-6.8)
.30 Remington AR
300 AAC Blackout (7.62×35mm)
.300 Whisper
.375 Reaper
.40 S&W
.45 ACP
.450 Bushmaster
.458 SOCOM
.50 Beowulf
.50 Action Express

Centerfire calibers metric measurement

5.45×39mm
5.56×42mm(5.56-6.8)
5.56x45mm NATO
6mm-223 Remington
6mm Fat Rat (6mm Grendel AI)
6mm AR Turbo
6mm BRX
5.7×28mm FN
6.5mm BRX
6.5mm Grendel
6.5mm Patriot Combat Cartridge
6.8×39mm (.277 Wolverine)
6.8mm Remington SPC
7.62×37mm Musang
7.62×39mm
7.62×40mm Wilson Tactical
9mm Parabellum
10mm Auto

Calibers which will not feed but which are used in rifles where the receiver functions only as a trigger group

.50 BMG
.408 CheyTac
.338 Lapua Magnum
.300 Winchester Magnum


AR-10 PLATFORM

Center fire caliber

Original caliber: 7.62×51mm NATO

.243 Winchester
.260 Remington
6.5mm Creedmoor
6mm Creedmoor
6×47mm Lapua
6.5×47mm Lapua
7mm-08 Remington
.308 Winchester - considered interchangeable with 7.62×51mm NATO according to SAAMI.
.338 Federal
.358 Winchester
.45 Raptor


#2

@Nicky, thanks for this.


#3

Definitely!
My 3rd build will use the AR10 platform so I did a lot of research on what caliber I wanted to do… Decided on the 45 Raptor. It’ll be sweet but going to take my sweet ass time with it.


#4

Thanks for posting this list.

Maybe it could be anchored at the top.


archived #5