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Uppers and lowers

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Old 12-22-2013, 09:57 PM
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Join Date: Nov 2011
Location: Miami Lakes, Fl
Posts: 96
Uppers and lowers

I have a basic question for the AR Platform guys. I have a bushmaster 223, would any upper fit on this lower? What modifications, if any, would I need to make to my lower?

Thanks in advance

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Old 12-22-2013, 10:39 PM
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Join Date: Sep 2009
Location: South Dakota
Posts: 400
Re: Uppers and lowers

Your standard mil spec AR15 uppers will work fine and dandy. Differences will come down to your gas block placement on your current upper and how it correlates to your current lower.

If you have a carbine rifle, then you'll have a carbine gas system on your upper and a carbine buffer/spring/tube on your lower.
Which means that you'll want to run a carbine upper on that lower.

Also, if you have a rifle with a 12" gas system, you'll want to stick to using rifle length uppers for that lower
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