What to do?

[no4mk1t]

Originally Posted by ithacaartist

Maybe--let's see some. Otherwise, a strange problem. The safety bar blocks the outward motion of the sear bar on that end. It's a little weird how this is malfunctioning, in that disengaging the safety shouldn't ordinarily move the bar. The system is, I think, harboring some sort of tension when the safety is on and created when the trigger is then pulled. I'd check the angles and conditions of the corners that interface between the sear and striker, in addition to the sear spring, and range and smoothness of all parts' motions during the process. Did you remove the sear bar during the cleaning?

It is my uneducated guess that the sear bar surface being rounded off a bit is allowing the striker to be held on the rounded portion when the sear bar comes into contact with the safety bar. There is not enough clearance for it to release as it is wedged up against the safety bar. As soon as the safety is disengaged, the striker slips off the rounded area. I would assume this area should be squared off and sharp shouldered just like any other striker/sear engagement surface.