Hi Greg
Thanks for the brainstorming. I was just thinking that with such tight/fine mechanics on this little gun anything out of whack, like a groove that's not supposed to be there, might contribute to this failure to lock back, like maybe the spring is "sinking it's claws" into the protrusion more than it should.... I'm no engineer but I'd almost think that if that groove had anything to do with it it would be locking back more than it should not less. I'll keep tinkering, looks like karh is a few week out on a new slide lock to test.
Thanks again
SavageFunk