Mystery bracket

[rgg_7]

Anybody's guess as to who did the work. If you know rifles history that would be a good start. Does the previous Owner have the scope and rings? There's quite an offset to get a scope over the centerline of the bore most likely the scope rings were custom made to match the bases. I would remove them and have the holes plugged and install a Mk1 micrometer ladder sight and go shooting. The 300/600ytd battle sight does not offer any adjustment so I'd improve on this feature. Ron (Canada)