Uhlan
Bearcat
Anyone know of an online source (other than ebay ) where I can get a Mark 1 magazine??
Mk I and Std buttons are 1/4" diameter; Mk II and later buttons are 5/16" diameter and may bind up in an A-54 frame. This can be fixed by filing the edges down.The current MKII, MKIII magazines will work. Should be available directly from Ruger. The button is reversible so no issue there.