One thing to be aware of, is that you'll also need to have the magazine tube shortened, at least if it's flush with the end of the barrel as most are.
The 16" rossi .357 with scout-mounted red dot and Abraxas titanium artificial-environment suppressor. You can see in the above pic that I had to shorten the magazine tube slightly to allow the muzzle to extend enough for threading:
I had mine done by a local gunsmith that had done numerous things for me over the years. IIRC, it cost something like $125-$135 including shortening of the magazine tube and relocating the mag tube end cap.
IIRC,