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Possible to change AR between .22 and 5.56 round ?


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Old 07-28-2012, 03:38 PM   #1
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Default Possible to change AR between .22 and 5.56 round ?

Is it possible to swap an AR 15 between rimfire rounds to 5.56 rounds? I would like to be able to practice with my AR at my local indoor ranges, and possibly change to the higher caliber round when going to the desert or a rifle range.

What parts would I need and what problems would I run into if it is possible?

Thanks in advance!

===edit===
messed up the title, meant to say 5.56

Fixed it for you- C3

Last edited by c3shooter; 07-28-2012 at 04:37 PM.
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Old 07-28-2012, 03:48 PM   #2
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Originally Posted by canyon289 View Post
Is it possible to swap an AR 15 between rimfire rounds to 5.56 rounds? I would like to be able to practice with my AR at my local indoor ranges, and possibly change to the higher caliber round when going to the desert or a rifle range.

What parts would I need and what problems would I run into if it is possible?

Thanks in advance!

===edit===
messed up the title, meant to say 5.56
Yes, you can buy a dedicated .22lr upper or a conversion kit.

http://www.brownells.com/items/dedicated-22lr-upper.aspx
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Old 07-28-2012, 04:36 PM   #3
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HOWEVER- if you buy a .22 rimfire rifle, do not assume that because it LOOKS like an AR 15 that you can just swap uppers. Most of those .22s do not have (or need) a buffer, and there is a size difference on the lowers.

FWIW, the US military has used a .22 LR adapter for years to shoot .22 LR from an M16 (for training where ranges are limited)
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Old 07-28-2012, 04:42 PM   #4
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FWIW, the US military has used a .22 LR adapter for years to shoot .22 LR from an M16 (for training where ranges are limited)
A .22LR has enough juice to cycle a M16?
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Old 07-28-2012, 05:45 PM   #5
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Oh yeah. Use THIS: http://www.txmarks.org/cdfiles/Individual%20Weapons/TM%20M-16%2022LR%20Adapter.pdf

What it does is replace the bolt/ bolt carrier group (and magazine) and converts the M16 to a blowback action.
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Old 07-28-2012, 08:17 PM   #6
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he cant buy that commercially c3, he'll have to buy a commercial adapter......works the same thoug.

http://www.cheaperthandirt.com/product/ARR-059
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Old 07-28-2012, 09:41 PM   #7
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Originally Posted by c3shooter View Post
HOWEVER- if you buy a .22 rimfire rifle, do not assume that because it LOOKS like an AR 15 that you can just swap uppers. Most of those .22s do not have (or need) a buffer, and there is a size difference on the lowers.

FWIW, the US military has used a .22 LR adapter for years to shoot .22 LR from an M16 (for training where ranges are limited)
Thats what the USAF was using when I went through basic in 84. Though I think it was more for budgetary reasons than lack of range space. I was less than impressed with the results. And I was lucky, mine only jammed a couple of times. Some of them wouldn't cycle for anything. Thankfully, I never dealt with them again. Find a good one if you go that way.
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