First off, let me appologise for ruffling your feathers and if you weren't so homophobic, I'd give you a big hug, ass grab and all (kidding man relax)
It wasn't on purpose, i simply went on ADCO's site and didn't find anything explaining such a process so I thought you were thinking about ar barrels.
Now that you've shed more light on the subject, I'M IN!
You can send yours AND I'LL SEND MINE to them for barrel extensions, sure beats having to fit aftermarket barrels onto my M&P9 (problem is, noone even makes a barrel yet for the 9mm so this is a great alternative).
If you can talk to them, then let me/us know how much it costs, turn around time, etc...
I would want threads that work with either a Gemtech Trinity (1/2x28 or M13.5x1LH) or AAC's Evolution9
See what they say and let me know man, right on!