I have a pair of Remington .44's. I bought two of the conversion cylinders and they work great. I can shoot .45 Long Colt in them with no problem. And as for the thing about them being illegal or should be registerd... It is my understanding that a cartridge gun's frame would be registered but not the rest of the parts ...including the cylinder. The cylinder is a gun PART...I wouldn't complain...
Heck I am glad the Gun Gestapo hasn't got thier paws on regulating the conversions and any self respecting person who agrees with the second amendment should be glad also.