WILL NOT FIT 22/45Factory Ruger 90062 9 round magazine with SILVER BASEFor Mark 1 pistolsFor older Mark 1 (right hand follower button) you will need to swap the button to the right side. The follower can be swapped out to make it 10 round.The button shape is key on these to not bind in the frame. The newer button on the 10 rnd mags can get it stuck in there. Click Here for our page on how to properly adjust your magazines to feed properly *NO RUGER magazine comes from Ruger perfect.