Just had one done last spring by Hayes Custom Guns 3gun (some USPSA) pistol and has held up great carried in a Kydex holster and not showing wear marks (yet)
Email Odin works. They are pretty good about getting back to you. I believe they do offer one for your PSA lower but I think it’s different than the NFA mag release
On a barrel that long your muzzle pressure will be almost nothing by the time it reaches your comp. especially if it is a blowback system. Of course it’s just an opinion but I’d buy a cheap comp and spend the savings on something more worthwhile
I had a hard time finding buyers for the 6 boxes of 44mag talon rounds. I basically got hollow point money for them So I’m guessing not as much as you think