15mm works out to about .590" and 5/8 is .625. A good machinist could turn your muzzle down to a smaller diameter and fabricate a sleeve that would go over that thinner portion. It could be silver soldered or TIG'ed in place and then threaded to 5/8". More work than a normal thread job but easily done by a competent machinist.
15mm works out to about .590" and 5/8 is .625. A good machinist could turn your muzzle down to a smaller diameter and fabricate a sleeve that would go over that thinner portion. It could be silver soldered or TIG'ed in place and then threaded to 5/8". More work than a normal thread job but easily done by a competent machinist.
A fresh bottle of Loctite red thread locker would hold this in place forever.
That might be ok for a flash hider but if its for suppressor use I'd want something more permanent. Lots more stress and definitely more money involved!!
Favor's Gun shop in Terre Haute. His shop is just off Fruitridge. He has a full service machine shop in the his shop. Give him a call.