Pull the plunger back to cock it and turn it clockwise to lock the safety , that makes it easier when you put it back in, take the screw out on the left side of plunger. Put the thumb safety off ( forward) hold trigger and the plunger should pull right out.
Then do it in reverse to put it together
Pulling the trigger allows the sear to move so it comes out easy.
Having the plunger cocked and locked makes it easier to get the screw in when you put it back together . Pm me your number if you have any problems