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I turned the one for which you have to stick an allen key into the hammer spring and turned it CCW 1 complete turn (360 degrees) and got about 40 fps more at 250 bar bottle pressure and with 44.75gr pellets.

Mine only had 660 fps without mods with 44.75gr pellets. I now have turned the hammer spring 1 turn out and getting 700 fps with .30 cal jsb exact 44.75gr. What else did you do to yours? Drill out barrel port and align it better? Polish bolt probe? Longer valve pin?

I'd rather not send my gun in. If they just send me a new cover plate and pin, I'll fix it myself. If they can't do that, then I guess I'll have to make myself a new cover plate out of some decent steel. For now my gun still cycles and fires both in semi- and full auto, but sooner or later...

I also bought the Blitz 777 .30 cal one month ago. Shot about 600 rounds with it and had lots of fun with it. Love it's accuracy. Mostly shooting semi-auto (80% of the time) but damn, that full auto is impressive. Designed and 3D printed my own moderator for it just for the looks (empty can)...