Hi
@The_Rev920,
Welcome to the forum from the frosty Wild Wild Upper Midwest.
That's a very interesting contraption you have there. Does it function properly? Have you put live rounds through it yet? The XD9 Mod.3 has a stock 4" barrel and matching slide, hence the extra 1/2 in plus threads you have hanging out. I'm curious if the barrel/frame linkage is the same between the XD9 and the XDM models. Does the XDM barrel fit in the XD9 frame/slide to allow proper operation? I have one or two of each but never tried swapping barrels. "Close enough" might not be good enough and could cause problems. I'll bet
@xdman might have a thought on this.
You might be surprised how often this question comes up re: threaded barrel for the XD9 Mod.3. Springfield does not offer one. I haven't found an aftermarket part yet. But maybe Bar-Sto Precision or other manufacturer will decide that they can sell enough to make it worth their while.
In the meantime, if that clever contraption of yours works properly, you could have the barrel cut down, crowned, and threaded to fit the comp with the stock slide. But I'm sure that would blow your budget. Just a thought.
Really, this is interesting. Keep us informed. I'd like to see what you work out.
Thank you for your indulgence,
BassCliff