My take away from their term "pre tensioned barrel" was more about the barrel being fit better than a stock "drop in" barrel. Tighter barrel lock up will delay the unlock time, keep the barrel in battery longer, and help with improving the said accuracy of said pistol.
Only really heard or this on rifle or a few revolvers...not sure what use it would be on a non fixed barrel that is not a bit longer. I would say gimmick or possibly a mistake for some other better fitting of barrel to frame/slide
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