To sum up:
- The CMR-30 fires .22 Magnum ammunition which is still a rimfire type round.
- It can have a 16" barrel and be non-restricted as it is not a semi automatic centerfire rifle (rimfire ammo)
- But it is restricted because it has a telescoping stock that allows it to be fired below 660mm Overall Length
- IRUNGUNS has manufactured a Non-restricted versions by pinning? in spacer blocks into the stock that prevent it from collapsing to below 660mm.
So its a semi-auto rimfire rifle, that can't be fired when it is shorter than 660mm thus it is non-restricted. Other retailers may have restricted models which have a fully collapsible stock.