The AK74 receiver had trigger pin humps which made the receiver sit a little high in my AK Builder jig. When I drilled the trigger pin hole, it was lower in the receiver than usual. Had to modify the trigger's rear legs by filing about 1/8 inch of material off the bottom of them so the trigger would sit level. The top of the hammer had to be trimmed to let the trigger hold onto it when cocked.
I will have to grind a depression in the jig for the humps so I do not drill the trigger pin holes too low again.