I've got a bit of a stupid question regarding MP5A3 stocks:
Why are their butts concave? Why aren't they convex like G3A4 stocks (I know early MP5 stocks were convex, but while they eventually became concave, G3A4 stocks remained convex)? Or flat like MP5A2 stocks and G3A3 stocks, UMP stocks, B&T MP5 stocks, &c.? The specific shape of MP5A3 and MP5A3-F stocks in particular seem like the worst possible buttstock shape, with possible exception of ye olde crescent (but that, at least, I understand the why of).
Thanks!
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