You may also consider a small reflex sight such as this.

I've never used one on a shotgun, but really like them on an AR or handgun. The units are very robust and would stand-up to the rigors of hunting.

Last edited by StudDuck; 01/06/17.
24HCF in its entirety, is solely responsible for why my children do not have college funds, my mortgage isn't paid-off and why I will never retire early enough to enjoy the remainder of my life.