Don't know where you got that math, but a U.S. quarter (0.955" dia.) at 50 yards is just shy of 2 MOA. 6 MOA at 50 yards would be 3 inches.
With that out of the way, I would HIGHLY recommend sticking to the a factory single-shot model (MARK I's) as the mag fed models don't single feed well with or without a single-shot adapter. The only outfit making a single-shot adapter for the magazine fed Mark II's is Lowery's out of Australia and it's just a solid piece of plastic in the shape of a magazine with a narrow and shallow trough in the top. Many have complained that placing the round in the trough isn't always easy given the small port on these rifles. On a dedicated single-shot rifle the whole bottom of the action acts as the trough so you can just drop the round in the action.
Also, does it have to be iron sights or can it be target sights (rear peep/front globe)? If it can be target sights the Mark I FVT is the way to go as it's a single-shot.
It's a shame nobody makes a good affordable single-shot falling block rimfire rifle anymore as that would be the most ideal configuration for your needs.
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