AR-15 buttstock threading?

glock9x19

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Hey guys!

I was just wondering what the thread diameter (ANSI specs would be great) is on the AR-15 buttstock where it attaches to the reciever.

thanks a lot

-Mike
 
thanks for the quick replies!

USP, If you have both that would be great! (I'm not sure which one urbanops gave me)
 
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