I have a similar problem… when I first got the rifle and pmags the bolt catch didn’t work with them… last time I had the rifle out it would randomly lock back on the last round and sometimes release on its own… if I try the finger in the magwell and push up the bolt catch it barely holds the bolt… a good jolt and the bolt will drop… inspecting my bolt catch carefully I can see that the hook appears to be bent to the side… your pictures look very similar to my beat up bolt catch, looks slightly bent the same too… I now believe that using the pmags has caused my bolt carrier to smack my bolt catch and slightly deform it causing a very similar issue to what you describe…
Well… I got to say you guys helped my figure out what was going on with my AR180… now I have to figure out a fix or get a new bolt catch… hope this helps and you get it figured out…
Not sure how much help I was.....
I know that Armalite lists a lot of 180-B replacement parts on their website. You could basically rebuild your rifle with everything the sell.
Whether or not they'll actually ship to you up here is a different story.
I believe Wolverine originally imported these guns, so maybe they might be able to help you out.


















































