MR-7 rifles were great guns. A friend has one in 30-06 and it prints anything you run through it under 2" at 100yds. Not many loads go MOA, but if it'll run ALL loads under 2" then it's a keeper.
I never heard about any lawsuits, but the gun used "parts" of all the popular rifles, Bolt handle was Ruger, bolt and lock-up and scope bases was Remington, floorplate and box mag was Browning, trigger, safety, and bottom of the action was Winchester.
They just weren't selling, is the biggest issue. Kind of pricey, around $600 new, and you could get any of the "big" bolt action names for the same money or less.