Not sure of the frame, I looked up the numbers and it was born in 1970. It has the 5.5in bull barrel. the thing is a tack driver. It was a family hand me down I got afew years ago. I thought it looked funny so I just put it in the safe. I got it out the other day and boy was I surprized.My great uncle bought it new to coon hunt with. I can see why. I would like to find acouple more mags for it. Do they still make MK1 mags?It depends on the frame of yer mki. If i recall correctly...you can make a slight mod to the ii or iii mag and make it fit. Have you checked Rugers site?
ok,thanksI'm not sure. My uncle has one...shot it...loved it. Came home and bought a MKii bull barrel stainless. Great gun. It is fickle about it's ammo though. I'd suggest you hit up Ruger and ask them. Or, start calling local gun shops. If they don't have, ask them to keep your number in case one comes in. Or, check on the mag modification. I remember reading about it a while back. I'll see what I can find.