I finally managed to remove the upper receiver from the frame on my Ruger MKII Target Model, thanks to the people on this board. I also detailed stripped the hammer/sear group. This gun was filthy. I reassembled the hammer/sear assembly. Reinstalled the upper receiver to frame. Inserted the mainspring assembly. Pulled backed and released the bolt. Pulled the trigger and…nothing. What am I missing? I can’t find a detailed manual anywhere. I even tried those firearm disassembly books and the guide doesn’t go into that much detail. Any help would be appreciated.