Hello I was shooting Sat. morning ,had a malfunction, I pulled the action and it seemed like the firing pin failed to retract, not thinking I put it back together and of coarse it will not open.
I am a little frustrated as this is one of my favorite rifles for club matches.

Firing pin is retracted out after pulling the trigger.

If you cock the action by opening the lever is the firing pin still retracted out?

Try cocking the rifle and then taking the action out.

Well to-nite I'd give another try ,to get it apart. the cleaning rod didn't do anything, so I started taping and rotating the action. 
after awhile the action dropped some and I started driving out the pins that were exposed, and the action dropped out.
I don't know the proper name of the part, but it's a cam with a paw on it that's broken off. Next I will need to one or have one made.    *  Fond a cross section of the rifle, the part is called a (tumbler).