Yes, there is a screw on the back to the receiver that screws into the "thru-bolt". It rather hidden. To get to it, your gonna have to remove the flat barrel retaining spring. Dont pry on the stock with the screw still in there...it'll crack the wood. Also, did you remove the breech block retaining clip as well? If not, thats something your gonna have to do too.
Good luck.

Dustin