I found this forum the most appropriate for this topic. About a month ago when I was looking up a ton of Ross Rifle info and pics I stumbled across this very strange machine gun made in WWI. It is called the Huot-Ross Automatic Rifle. Like other bolt actions of the time, a man by the name Joseph Huot converted the Ross Rifle into a machine gun. There's a picture in the link below. I still haven't found much info on it besides what I already typed and that it only got to prototype stage.
WarMuseum.ca - Objects and Photos of the First World War - Weapons and Ammunition

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- Re-Armored M91/30 Mosin Nagant made by Izhevsk in 1943
- T/C Venture .270 Win. w/ Bushnell Scope
- S&W Model 22a w/ Red Dot Sight

I think I'm doing pretty good for buying that many firearms at 15

that would seem to work, with the Ross being a straight pull mechanism with rotary locking lugs. sort of a mechaical operated Garand!!