ruger mk 1 action barrel thread size ???

[Kamel]

Just to be a little nit picky, just cause I want to be, there is no such thing as a Ruger Mk1 rifle, the MK1 is actually their first auto 22 pistol. The original Ruger rifles were Ruger M77s, the next is the Ruger M77 MkII. It is a common mistake made.