G.T.
If you would like to design a proper 9mm barrel, one that would accurately shoot a 115 to 125 grain projectile at a proper speed, I, for one, would be interested.
9mm Parabellum barrels are rather sloppyly fit at .357 to .358 grove diameter. Why so loose?!? We are still trying to find out.
Do humanity a service and take up the challenge.
Sieger
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