HW 85 Cal. 6.35 How common is it?

Can you explain the mod(s) that elevated this springer to a 50fpe capability?
I can't because I didn't do the job myself. It was beyond my knowledge and understanding. The guy who did it, a Slovene gunsmith and airgun aficionado, told me installed a custom made spring, a modified piston and also modified the cocking mechanism. He told me not to try to disassemble the gun myself since I will not be able to reassemble it without help and special tools due to the piston design and the spring tension (If I have to get it serviced, I go to his workshop). He told me he based the mods on the GAMO Magnum GR 25, if this can help you. To be honest, I removed the stock but the only thing that really stands out is the beefed up cocking lever (The stock was also modified to accommodate it).
 
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