I have the plain barrel model and have some questions about getting the end of the barrel threaded for a suppressor.

1. Does anyone know a place or someone who has experience
at doing this that I can send my barrel to?

2. I don't have the tools to remove my barrel, can I send the
whole upper minus the bolt without using a licensed firearm
dealer or does that violate the law

3. Does Smith & Wesson sell threaded barrels? and If so does
anyone know how much they cost?

4. Can I send my upper to Smith & Wesson and have them
put on a threaded version

5. If I were to buy the tools to remove the barrel how much
would I be looking to pay?

6. Does anyone have any other ideas on the best way for me
to get my barrel threaded using the least expensive method