I'm working on a new build and am hung up on assembly. When I get the mainspring housing pinned and cock the action, I drop in the thumb safety. After that, I can’t get the hammer to return, the trigger is completely locked out. If I just take the thumb safety out and let the grip safety hang loose, the trigger will action the hammer.
I’ve tried several different mainsprings and several different grip safeties, to no avail. Can anyone help me with what’s catching on what?
Thanks all, appreciate any input.