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Old 01-29-2013, 06:39 PM   #1
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Default S&w mp 15-22 upper swap?

can you put a 5.56 m&p 15 upper on the 15-22 lower?plz help if you can...



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Old 01-29-2013, 09:14 PM   #2
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No Sir~ Dimensional differences in the upper and lower receivers. In the case of the 15-22 it also has a polymer receiver not aluminum. But S&W changed dimensions to prevent that from happening as far as I know!

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Old 01-29-2013, 10:56 PM   #3
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So what about putting a 9mm or .22 upper on say a new frontier armory lower?

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Old 01-31-2013, 03:41 PM   #4
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Quote:
Originally Posted by TNARG View Post
So what about putting a 9mm or .22 upper on say a new frontier armory lower?
I have an ATI .22 tactical upper on a new NFA lower.
The S&W 15-22 upper fits on NFA lower, however the mag seems loose.

The ATI .22 doesn't fit on the mp15-22 lower
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Old 01-31-2013, 04:35 PM   #5
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As far as I know it takes a true 5.56 with a 22lr conversion to do what you are asking. Not the 22LR's as the majority of them are custom machined for the 22LR. Find a smitty/machinist to test your theory. I'm betting a lot of modifications will be required.



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