Can’t see any point in having an Iver Johnson
M1 carbine - no purpose
"You said ANY input"
Sorry, couldn’t resist when I saw the note on the picture … just kidding …but I did have a Universal that broke a slide once.
Seriously,
Are you sure the slide is crawling over the rails, or is it just shifting into the notch and getting stuck at that point ?
Do you have a set of calipers?
If I remember correctly. The Universal I had did something similar and slicking up the rails fixed it (ONE of the times it broke). That gun was the only one I was happy to sell and never missed after it was gone.