Tow ideas comes to mind seeing it happen to a couple buds of mine using Glocks with ext mag releases.
Try switching to the original mag release or firstly try popping in a heavier spring.
I tend to agree with lumpygravy that most manufactured "polymer" guns have some sort of checkering
on their guns...the serrations on the other hand I have not seen.
Ne one know of an optic mount that doesnt
require the third pin at all for installation.
I think the SJC just needs another hole drilled by an armorer..ne other???
Happened to me a lot at matches as well as training.
High gripping and holding down the slide release.
Had to adjust my grip a bit, which took a lot of work
getting used to.
But was worth it in the end!
I actually posted that very question today.
My idea was to get the hole drilled and change the
locking block completely to that of the newer version.
I think that theroretically it might work .
Want to shoot open with my gun that has brought me this far...dont wanna change it!
Any more views.