I just purchased an m2 with a rifled barrel in realtree apg and the front sight is hard to see when shooting at a target. Is there an after market sight that I can purchase for it. I purchaed a HI-VIZ front sight at bass pro but it won't work because it has threads and the one on the gun is a fixed sight. (pressed on the barrel) I did put a dab of florescent orange finger nail polish on it and that helped but that is not what I want. A proper sight would be nice. Any help would be appreciated.