I'm looking for someone who has a press to remove a front sight assembly from an AR upper. Yes, I know that you use a 3/8 punch and knock the pins out, and that hasn't worked. Heating it in the oven hasn't worked, using Kroil soaking it overnight hasn't worked either. Yes, I have a big enough hammer (32oz) and have been hitting it hard enough. I have removed front sights before, and they have never proved this difficult. I have even taken it to a gun smith in the area who couldn't remove it. Thoughts, suggestions, assistance?