The vortex low mount purchased from amozon
yes you will need to remove your rear sight and install an attaching plate in the dovetail
all though the low pro mount works well I still had to modify it some with a dremal
there is also a rear sight sold by a company Sight Mount which offers a picatinny rail with a two dot rear sight integrated in the rail
so you'll be able to use your gun with or without the optic
my razor came with a picatinny attachment
hope this helps