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That would be a negative ghost rider. You can put a 15-22 upper on the 15 lower, but not the other way around
 

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Dimensions of a 15-22 are different than for an AR-15.

In addition, the .22LR is a blowback, no buffer.
 

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Tell you what. Let's find out. I so happen to have a 15-22, mags and a 5.56 lower sitting around. I'll post a couple pics in a sec. I will however, voodoo curse anyone who laughs at, pokes fun at, or otherwise defames my wifes pink tiger stripe camo 15-22 with a black magic spell allowing the fleas of a thousand camels to make homage to their armpits.
 

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OK, so after mix matching everything, here's the outcome. The 15-22 upper did attach to a new NFA polymer lower. It isn't what I'd call a great fit by any means. This is it with a Chiappa .22 mag.


The Chiappa mag fit with a small amount of play. When using the action, it chambered a round in what appeared to be normal functioning. With the 15-22 mag, there was a lot of play. I'd say 1/4 in or more. It did chamber a round, however it took a little effort. I might have fired a round with the Chiappa mag, but I wouldn't do it with the S&W mag.

Here's the S&W mag in the 5.56 lower. Lots of play. Not likely functional though the mag did stay in place.


At the end of the day, I wouldn't try it if I wanted to ever use my gun again, and liked my face as it is. I tried to put the ATI .22 upper for my DPMS lower on the 15-22 lower, no dice. Simply wouldn't go. And when I put the 15-22 upper on the 5.56 lower, the buffer tube was discontent to stay in its place to say the least.

Final conclusion--Don't do it.:cool:
 

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Not all but some are designed to work on a standard lower. Tactical Solutions has a .22lr upper that fits.
 

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So would say a 9mm upper or a 22lr upper fit and function on a 5.56 lower?
9mm I don't know.

Quentin said:
Not all but some are designed to work on a standard lower. Tactical Solutions has a .22lr upper that fits.
That black upper on my 15-22 lower is the ATI Tactical .22LR conversion upper that you can slap on your 5.55 lower and shoot. The one I got is this one:
http://palmettostatearmory.com/inde...ati-tactical-22lr-ar-15-upper-atim42228t.html

I got it in early Novermber for 349
 
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