M18x1, that is what I use on my rem varmint barrels. It leaves enough shoulder to tighten against and does not chew up to much of the barrel so as not to have an impact on barrel internal dimensions...
Type: Posts; User: Friwi
M18x1, that is what I use on my rem varmint barrels. It leaves enough shoulder to tighten against and does not chew up to much of the barrel so as not to have an impact on barrel internal dimensions...