How many caliber AR uppers exist?

[utoo]

.22lr, 223, some 6mm-x45 variant, 10mm, 9mm, .45ACP, maybe a .40 short and weak? .50 Beowulf, 7.62x39, .300 Whisper, 45 Professional, .50AE, .50 BMG (single shot or bolt action). Man, you can have whatever you want on the AR's lower receiver.

 

[jefnvk]

Forgot 458 SOCOM, 17 HMR and 22 WMR

 

[Too Many Choices!?]

Forgot .308, AR-10 is still an AR,

...

 

[Scottmkiv]

I know you are missing some. Doesn't someone do the WSSM family? and .243 I think.

 

[yorec]

.475 Tremors
6.8 Rem

 

[Raygun]

AR-15, without bolt modification

.17 Remington
.20 Tactical
.204 Ruger
.221 Fireball
.222 Remington
.222 Remington Magnum
.223 Remington (5.56x45mm)
.223 Remington Ackley Improved
6x45mm
6mm Whisper
6.5mm Whisper
7mm Whisper
7mm TCU
.300 Whisper (aka .300/221, .300 Fireball)
.338 Whisper #2

AR-15, with bolt modification

5.45x39mm (aka .21 Genghis)
6mm PPC
6mm BR Remington
6.5mm PPC
6.5mm Grendel
6.8x43mm SPC
.30 Herrett Rimless Tactical (6.8x43mm case trimmed to 41mm and necked up to .308; the 6.8mm version of the .300 Whisper)
7.62x39mm
.357 Auto
.40 S&W
10mm Auto
.45 ACP
.458 SOCOM
.50 Action Express
.50 Beowulf

AR-15, blowback

.17 HMR
.22 LR
.22 WMR
9x19mm

AR-10, without bolt modification

.243 Winchester
.260 Remington
7mm-08 Remington
.308 Winchester
.338 Whisper
.375 Whisper
.416 Whisper

AR-10, with bolt modification

7mm WSM
.270 WSM
.300 WSM
.300 RSAUM (probably any RSAUM)

And those are just the ones that I've dug up in the last five minutes. I'm likely missing some.

 

[1911user]

308 sized cartridges require an AR-10 based rifle as Raygun stated.

 

[3rdpig]

I didn't see 30 carbine in the above list and I believe that Olympic makes an AR in that caliber.

 

[buford1]

Is there a 22-250 upper for the AR-10????

 

[dtech]

I didn't see:

.17/.223
.17 Predator
6 WOA (necked down 6.8 SPC)
.25 x 45 (.25/.223)
.223 WSSM
.243 WSSM
.25 WSSM
6.5/.243 WSSM

And for the AR-10 I didn't see
.338 Federal
.358 Winchester

I've built a few of the .358 Winchesters and am about to launch into building some more wildcats on the WSSM line. The 7mm, .300 .338 and .358. The .358's brass will be trimmed a little to qualify for Indiana big-game legal.

 

[MMcfpd]

The .450 Bushmaster is still pretty new.

 

[Buzztail]

I'm really wanting an upper in 204.