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Old April 11, 2013, 12:11 PM   #17
Senior Member
Join Date: March 1, 2000
Location: Western WA
Posts: 7,820
The StG bolt/spring unit is almost identical in design to that of the CMMG. Looking into an aluminum AR frame and the same view of the Zamak (alloy of zinc and aluminum) StG frame is very similar.
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