Tom D - thanks. I purchased a Model 12 in excellent condition. I had always wanted one, and a local dealer had a deal too good to pass up. My experience with the model 12 is none.
After bringing it home, I tossed some snap cap shells in and noticed the locking of the bolt with a round chambered.
As you described, you either need to push slightly foreward on the pump mechanism to unlock the bolt or use the release.
I was worried there was something not right. Glad to know its fine.