Let's say that I had a Colt 9mm AR with the 16 inch tube, and was planning on converting it to an SBR via Form 1, etc. I'm working on the feasibility of this plan right now, and my big question is how to go about changing the barrel length. I'd want it shorter (obviously) and still threaded so I could attach a muzzle device, but I'm not sure about the best route. The options that I see are 1) cut down the barrel to the desired length, and 2) buy a replacement barrel in the desired length.
The primary issue with Option 1 that I see is finding a good gunsmith to do the work. This isn't something I'd want to trust the Professional Sight Installers at Scheels to do, but I don't know enough about the custom AR market to figure out who'd be good to send my barrel to.
The primary issue with Option 2 is that Colt doesn't sell 10.5 inch 9mm barrels to the public, so I'd have to get an aftermarket barrel, which would then ruin the whole point of building a shorty Colt 9mm gun, because I'd always know that the barrel wasn't right.
So the question is: does anyone have a real recommendation for who to send the barrel to for cutting?