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Discussion Starter #1
Hi Everyone,
I was just curious about something. I know that there are at least two different types of AR'S which are the AR 15 (5.56) and the AR 10 (.308). I also noticed that the AR 15 has a smaller magwell comparied to the AR 10 due to the rounds size. What I was wondering is what calibers upper changed can be made to an AR 15 vrs an AR 10?

Thanks,
Teky0101

PS: I would be extremely intrested to be able to switch my AR 15 upper for an extremely accurate and power cartridge. Does anyone have any suggestions?
 

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This quite the confusing question. You might think about rewording it.

I think you are asking what conversions you can do for AR15? I am sure there are others you can do but there are three I have experience with... .22LR, .223 S&W, 6.8mm. I believe there is a 6.5 Grendel out there too.
 

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Just off the top of my head, the AR-15 mag well will support: .22lr, .223, 6.5Grendel, 6.8 SPC, 7.62x39 Russian, .450 Bushmaster, .458 SOCOM, .50Beowulf, 9mm and .45ACP. I'm positive there are many others.

AR-10 can go with .270, .308, .338 Federal + more I can't recall at this time. Remember that AR-10 specifically describes the Armalite rifles but many other manufacturers are offer these same larger caliber rifles.

What would be great is if someone would make the uppers in the various AR-15 calibers that attached to AR-10 lowers and used blocks to allow the smaller mags. Then we could just have one size lower and switch to any caliber we wanted with a quick upper change.
 

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AR-15:
.204 Ruger
.22lr
.221 Fireball
5.45x39
.223
223WSSM
243WSSM
25WSSMM
6.5Grendel
6.8SPC
.300 Fireball
7.62 x 39
9mm
.40S&W (don't know if there are any uppers in this caliber)
.45ACP
.450 Bushmaster
.458 SOCOM
.499 LWR (no longer made)
.50 Beowulf
(tons of wildcats)

AR-10:
.260 Remington
6.5 Creedmore
.243 Winchester
.308
anything that matches the OAL of a .308 cartridge
 

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300 whisper
338 whisper
17 remington
20 tactical
20 practical.
10 mm
 

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this is from Wikipedia

* 7.62x25mm
* 9mm luger
* 10mm
* 40 S&W
* 45 ACP
* 5.7x28mm
* .50 AE

Rifle calibers:

* .17 Remington
* .17 Remington Fireball
* .22 Long Rifle
* .20 Tactical
* .204 Ruger
* .221 Remington Fireball
* .222 Remington
* .222 Remington Magnum
* 5.45x39mm
* 5.56x45mm NATO
* .223 Remington
* .223 WSSM
* 6mm PPC
* 6mm-223 Remington
* .243 WSSM
* 6.5 Grendel (.264 cal)
* 6.8 SPC (.270 cal)
* .300 Whisper
* 7.62x39mm
* .450 Bushmaster
* .458 SOCOM
* .50 Beowulf
 

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Discussion Starter #8
Thank you everyone for the outstanding responce. This will surely give me a lot of options to think about. I was curious though since the AR 15 can change to to so many powerful calibers what happens if the gun was origionally created for a .223? Is the recoil springs on the lower powerful enough to handle the caliber? Thank you for any help on this and I appologize if this is a AR noob question.

PS: MY current gun is a s&w m&P AR 15, if this helps.
 

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Thank you everyone for the outstanding responce. This will surely give me a lot of options to think about. I was curious though since the AR 15 can change to to so many powerful calibers what happens if the gun was origionally created for a .223? Is the recoil springs on the lower powerful enough to handle the caliber? Thank you for any help on this and I appologize if this is a AR noob question.

PS: MY current gun is a s&w m&P AR 15, if this helps.
you can get heavier buffers for the heavy calibers and im pretty sure there are extra power springs
 
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