School me on muzzle threads

[Synthetic]

A thread size has two measurements
- Major diameter
- Pitch



Pitch isn't that critical from my experience.

I do think major diameter is important though, choosing a suitable major diameter depends on:
- Barrel outside diameter before threading
- Caliber, ie. the diameter of the hole
You want to ensure there is sufficient thickness of material left on the barrel after threading. For example, cutting a thin barrel with a large caliber to a small major diameter is not the best option.
However you also want to make sure the thread grooves are sufficiently deep to achieve a strong connection with the suppressor. Theoretically, the deeper the thread grooves, the less chance of the suppressor "slipping" off. With a heavy barrel and a small caliber, you can afford to cut deeper threads while maintaining sufficient residual barrel thickness.

So it's all about finding the best balance point, and is probably best left to the suppressor fitter or gunsmith to decide.