Anyone know anything about he use of night sights on the AR15/M16 rifle. Do you have a favorite brand, do you use front and back or just front. Also do replacement AR15 back sights fit a Vietnam era M16 back sight. I am concerned with the width of the back sight. The two hole back sights are the same size and I do not like it for night shooting. I would like to put on updated rear sights so I have the large aperture and the small aperture. Any ideas would be welcome. If there is a thread started on this let me know where to look, Thanks bigguns911.