I know one training school who doesn't allow students in their carbine classes to use home build rifles. I read something the chief instructor said on the net, so I don't know if they reject certain brands, but I have seen him say they don't allow home builds because of the high failure rate. I guess when someone is having problems, it disrupts the class.
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I'm not the kind of poster who goes 20 pages trying to prove a point. I'll make my point with 1 or 2 replies and be done. I don't need your approval.