There was only one gun chambered for the Jet that I know of. Thats' the Model 53 S&W. They have .222 bore size and a real odd-ball. I can see no real reason to build a Jet.
Any Ruger #1 that won't group into round two inch groups with factory ammo needs work.
Any Ruger #1 that won't group into round two inch groups with factory ammo needs work.