I currently have a live M8c Spotting Rifle not attached to a 106mm RR.

Anybody got any ideas to mount on a tripod.

Mabye some kind of MaDuece adapter plate attached to gun.

you're gonna have to use your imagination on this one. as i remember it the 50 was mounted right on the barrel of the 106, just forward of the breech, using 2 big clamps. Good luck finding spotter ammo, only place i've seen any is at the knob creek shoot/show and even there it was more of a collectors item