The USA "tennifer" is indeed different than the Austria "tennifer." It came down to the EPA which would not grant US the various certificates to use the same materials. Hence, US had to fine a like and very close product that met the EPA.
This was a detailed topic in an armorer's class nearly three years ago. Gwdex writes up some of what Glock USA dealt with, in dealing with the EPA.
Neo-pagan, FORMER Libertarian, Cop, Gun Owner, Jewish Heritage - I'm the small talk at parties!
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Look Barry. You don't speak for me so shut your pie hole!