So I am looking at the slide and barrel of my JHP, from what I can tell there is just a bit of space around the barrel in the front. The front part of the barrel can be threaded of course - but it does not stick out of the slide - so a solution for this. I imagine a device with a thin portion to twist around the very front of the barrel, and it would be small enough to fit into that small cavity of the slide, without scraping against it. Another portion of the device would be a barrel extension really, but it would also be threaded, hell even a ring to cover it when it is not in use. This seems doable, right?