I have a flash hider/muzzle brake that is M15 x 1 RH. It can be put on any bolt action legally in Cali, because bolt action isn't Assault Weapon. It can be put on semi-rifle, but make sure the semi-rifle is featureless and not AW.
Flash hider/muzzle brake: $20
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I also have an adjustable die to cut M15 x1 thread. Adjustable die can be adjusted to open up to cut into slightly wider barrel than 15mm, then be adjusted to cut exact 15mm thread. It's also helpful to be removed (adjust wide) and put it back later (adjust small) to continue threading.
Die: $27
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I have the die starter M15 x 1, which helps guides the die in straight and square.
Die Starter: $15
Buyer will pay for USPS postage, which should be a couple of dollars.
Flash hider/muzzle brake: $20
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I also have an adjustable die to cut M15 x1 thread. Adjustable die can be adjusted to open up to cut into slightly wider barrel than 15mm, then be adjusted to cut exact 15mm thread. It's also helpful to be removed (adjust wide) and put it back later (adjust small) to continue threading.
Die: $27
---------------------
I have the die starter M15 x 1, which helps guides the die in straight and square.
Die Starter: $15
Buyer will pay for USPS postage, which should be a couple of dollars.