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@Sergey1972 I think I have identified my trigger issue. Part #115 appears to be missing. I have to check my miscellaneous parts and see...
No issue dry firing Gk1. Unlike the K1 it uses more air for dry firing and is louder for dry fire. Stay on top of your pressure so...
There is a piece of oring rubber that keeps the trihger adjusting screws from loosening. That oring just looks like foreign object...
Tighten the barrel itself to remove the play and set proper gap magazine to barrel.