My thoughts exactly! ��You probably didn't have it seated in one of the holes.
I shoot lots of collapsible stocks. Never had an issue.
Ah HA! I think that's the first mention by the OP that the stock was on an AR carbine. All the replies just filled-in that blank. I HAVE seen a shotgun completely wreck a (cheap) collapsible stock. Yet I've never seen it on a mil-spec AR.Colt M4