I have had a few D models over the years.
Every one was different one had an easy detachable bayonet, one had a fixed bayonet like every other model bayonet held on by screw.
The other one had no bayonet or anything to attach one, a factory modification.
There were a few other minor changes. I have a stock for a D model around here.
I wanted to see one of the rifles that West Rifle was selling to see how it was altered.
I was also interested how they worked for the buyers.