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K98 zf41

You may want to cross post this question to the Vintage Sniper Rifles section as there are a lot of knowledge people that frequent that section.

Good luck and Best regards
 
I can read through Law's book again this evening after work, but off the top of my head I believe there were primarily two. One was a rear sight base that was machined from the get-go with an integrated rail for the Zf41. The other was an "insert" that allowed basically any K98 to be fitted with the optic.