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Posted: 11/28/2008 8:07:08 PM EDT
I did a search and I found nothing on this. I just recently completed a build and I am having problems with the bolt. My build consists of a DPMS lower and A3 flattop upper. When I take the bolt out of my Olympic (which works perfectly fine in the Olympic) and place it into my DPMS upper reciever it is very tight. I can pull the charging handle back all the way, but when I release it, it doesn't go all the way back in without me having to push it. Are there 2 different specs of bolts or did I just get an upper reciever out of spec? I appriciate any help. 
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