[solidgear34]

It's a Western Arms, with what i believe are G&P steel internals but i'm not 100% sure. And i've got a bit more info, after the first shot is fired, and the hammer is pushed way way down, switching the selector switch to safe/full auto and then back to semi, pops the hammer up to its normal cocked position and lets it shoot one more round before you have to jiggle the selector again.

Looking inside after the hammer gets pushed way down, it looks like it could possibly be getting caught by the trigger/auto sear (that's the kind of flat piece of metal that moves when the selector switch is moved right?) , and switching the selector jiggles the trigger/thingie and releases the hammer to its normal cocked position. On Full Auto, the hammer doesn't even reset to the cocked position when shot. I don't really have much experience with GBBRs, so forgive any silly statements by me.

Could it just be the hammer is not installed properly? I did have a hell of a time getting that 150% spring in..