You can use a regular riflescope, but many have too much eye relief for a comfortable position. You will need to use some sort of extended or high extended mount. Armalite makes one which is pretty cheap. Weaver makes super cheap(junk) rings which work. . . .or you can find whatever you want from Larue Tactical to make this work. For my crossbow, I used the Weaver rings, but may upgrade to the Armalite.