I have a firedragon 9mm conversion barrel for my XD40. I switch barrels back and forth all the time. I haven't notice any damage and it works really well. I have a video posted on you tube if you want to check out the reliability of the conversion barrels. Just search you tube for my screen name rodasj
The name of the video is " firedragon 9mm conversion barrel" Hope this helps.
I have a 9mm Firedragon too. Only complaint I have about it is that I get jams with 9mm hollowpoints sometimes. I'm sure I could fiddle with the feedramp and work it out but I only use the conversion for screwing around at the range so I've never been too motivated to get into it.
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