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I converted my Gen 1 P99 .40 cal to 9mm. The barrel functioned almost flawless for 50 rounds 115 gr and 150 rounds 130 gr. Half the rounds were in the OEM spring and half were in a DPM spring system. I did have one failure to return to battery. It jammed up pretty good, but I was finally able to rack the slide and eject the live Federal American Eagle 130 gr round. Funny enough, the failure happened during the OEM spring. The DPM spring was flawless. Mind you the spring was the longest spring so I did receive some brass in the face area and on top of my hat, but flawless function none the less.
Overall, I would recommend the Jarvis barrel. The fit is very tight and the rubbing is obviously noticeable after 200 rounds. I did not send in my slide for fitting. My question to the forum here is: Will this rubbing or friction damage my original slide in any way?
If you have any questions let me know.