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Old May 9, 2013, 11:58 AM   #18
blfuller
Senior Member
 
Join Date: January 8, 2013
Location: Washington State
Posts: 246
The upper in the OP pic looks like it is machined instead of a forging. Probably because it is shorter. I wonder if they are using a current industry standard mag like an UZI or the Colt 9mm pattern.
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