Also heard of using Ontos with canister rounds as ambush breakers in convoys. I climbed into one at Camp Lejeune, it was pretty small. Might could almost put two of them on a lowboy.
As far as the M 85s go, they seemed to have a lot of feed trouble. The M2s in the M48s seemed to be more reliable from what I recall. Also, the M85 sights in our turrets seemed to mess up a lot; maybe they weren't saltwater proofed enough.
Coincidentally, of course, the builder for the Mark 47 is General Dynamics.
It may be that the Stryker's incompatability with the Mark 19 was designed in from the get-go.
-archy-/-