I bough a new barrel for my 1970's SportKing. The barrel is made by SciTac Inc. and is designed
to shoot 40-60 grain bullets.It has a twist of 1-11.25" to stabilize the heavy 60 grain Aguila SSS 22lr.
The barrel is also threaded for a suppressor. It is a matt finish stainless barrel that is drilled and tapped for a scope base. Here is a pic of mine with a Truglo reddot. I will take it to the range next week, after the ammo arives.