There are at least some Husqvarna top-lever hammer doubles that have receivers identical in appearances to Sauer receivers, save for finishing and decorations. It has been my understanding that Husqvarna sourced both top-lever receivers and back-action sidelocks from Sauer. For how many models, I do not know, although Husqvarna M52 is one and M48 may be another. I do not have copies of both Husqvarna-finished and Sauer-finished hammer doubles -- that appear to be nearly identical, so, cannot check dimensions of these parts.
Niklas
