H&R uses two actions for their guns. The SB1 is a low pressure receiver that is used for shotguns and muzzleloaders and maybe a couple of pistol calibers like .357. The SB2 is much stronger and is used for high pressure centerfire cartridges.
was thinking i heard that they wouldnt put rifle barrels on the shotguns but would put shotgun barrels on an existing rifle frame for you but couldnt remember where or when i heard that....
