Man I forget what exactly causes this, but its NOT that uncommon, your smith will have it up and running fast for you, and shouldn;t cost a penny, minus what ever he feels his time is worth
I have had a bunch of customers bring them in for this and my smith never even charged them to fix, so again, not a big deal if its the same issue the 11/87's I seen had
action stuck open, due to pushing the shell follower open with NO shell in things, just confuses the gun out of cycle, and things hang up?
there MIGHT be a few youtube video's on this too, if you care to look
as I know its happened to more than you here! LOL