HD, do you mean Remington "rolling block" rifles? Remington did make falling block rifles, but as far as I know they were only for sporting purposes and are MUCH less common (and much pricier!) than the common rolling blocks. Remington also made rolling block shotguns very similar to the military rifles, although they aren't very common here either.

Copies of Remington rolling block shotguns, and perhaps conversions of rifles to shotguns, were commonly made in
Belgium, too.