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Old October 4, 2012, 08:59 AM   #6
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Join Date: July 25, 2012
Posts: 755
Well and the actual lower receiver being milled to accept the different FCG.

But to answer your question, they have a mil-spec buffer tube. The parts that are not mil spec have to be that way under BATF regulations. They can not be easily and readily convertible. ALL of the parts that can be mil spec, are. It is as much mil spec as any other on the market.
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