Alright heres an update:
Its been about a day now, no success. I've made sure I've been hammering the side without the splines or grooves. I've hammered hard and the trigger frame is elevetated as well so theres room for the pins to come out. I've manage to make many dents/marks on the trigger pin and it still wont buldge.
Are there any tricks, or anything I can use to make this sucker move?