Originally Posted By mew:
makes sense. never thought about the magnification factor............
and Shawn you are saying a KAC rear will only work with a KAC front??
the 901 does not have a standard height rail. The front sight is a standard height flip up, but it is a part of the gas block, so you can't replace it.
due to the fact that the 901 rail is taller, you cannot use standard height rear iron sights because they would not line up with the front sight properly, due to the rail being taller. You are stuck with the rear sight that comes with the gun.
that's my understanding of it anyway.