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2/26/2017 3:41:32 PM EDT
I've searched and can't find the answer to this.  I am building a 9mm AR.  I plan to use a dedicated lower which accepts Glock Magazines.  Does the lower receiver hold the bolt open on last round or the upper?  I've seen reference to both.

Thanks!
2/26/2017 3:51:01 PM EDT
[#1]
Whoops.  Sorry, wrong forum.
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