Up for sale is a Windsor D196 mount 3/8 x .050 bar. I took it off of a Remington (now sold) to put it on my 10-10 only to find out my Mac was a D176 mount. It looks to be near new as the remains of the label can still be seen by the slot, but it looks like it sat outside as its kinda rusty. The tip moves a little, but it’s almost seized. I’d bet it could be freed up if you soaked it in vinegar and oiled it up, but I can’t be certain so the price reflects that. I’d like to get $35 plus shipping, but feel free to make me an offer.