Mark I or .22 Standard

[gregarat]

My Ruger doesnt have A-100 stamped on the frame. The "bump" for the follower button is on the left side. I have to buy Mark 1 mags, and swich the button from right to left for them to fit. Mine was purchesed between 76-78.

So eather we have a Standard mod. , or we are both in the ? boat. Whatever the gun is called, its a real nice .22. $50 is a good deal.