After only 250-300 rounds my M57 slide is starting to get stuck in the rear position:

All of the binding or stickyness seems to happen in the last 3/4-1" of travel.
It only takes a slight nudge to get it moving again, but nonetheless it's screwed up as it will get stuck like that frequently during normal firing.
I am by no means a pistol expert (she's my one and only!), but I can guarantee it's not a cosmoline or lubricant issue.
Pretty confident it's not a reassembly error because I've watched/read any youtube videos, or forum guides on dis/reassembly that I could find... but I could be wrong!
Any help or insight would be much appreciated!
Thanks in advance

All of the binding or stickyness seems to happen in the last 3/4-1" of travel.
It only takes a slight nudge to get it moving again, but nonetheless it's screwed up as it will get stuck like that frequently during normal firing.
I am by no means a pistol expert (she's my one and only!), but I can guarantee it's not a cosmoline or lubricant issue.
Pretty confident it's not a reassembly error because I've watched/read any youtube videos, or forum guides on dis/reassembly that I could find... but I could be wrong!
Any help or insight would be much appreciated!
Thanks in advance


















































