Actually, the USG rail has the advantage of adjustable back-up sights. The P90's that are in service with the US Secret Service have the USG rail.slagged said:The rail is the over priced one from FN. The dealer threw it in when I tried to back out. I was looking for a tri rail.
No. You don't need to remove the optic at all. The back-up sights consist of a peep-hole rear sight along with an adjustable post front sight. The rail is on top of the back-up sights.ShipWreck said:Ya gotta remove the optic t o use the sights on the rail, right?