Vern, Not sure exactly what you are asking or what you mean by backbored, but the exterior edge of HK toggle knobs holes are "generally" chamfered or beveled... other manufacturers are not.
My Krieghoff Parabellum reference book is packed away somewhere, and so are my Luger Photo Archive CD's so I don't have any photos I can post at present to compare.
Hopefully John D. will see your post and chime in on your questions. I am no HK expert, but I do not like the year stamping in your slightly out of focus photo of the chamber area. The year digits don't seem to line up as well as I would expect an HK to appear. Do you have any better photos of this gun?
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regards, -John S
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