Yes the OTC tag is good for the entire year.
I missed all of hunting season in MT this year, and went down to NM in the beginning of February for an OTC Aoudad hunt. It was my first time hunting out of state and it was a pretty cool experience.
I'm not super familiar with the differences between the f, the fs, the m9, vs m9a1.
I do know the g models are de-cocker only. The lever springs back up to the fire position instead of staying down in the safe position when you decock the pistol like the other models.
The D models are double...