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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
 

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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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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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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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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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