I had the HiViz on a mossberg 835 that I used to own and it helped me kill the biggest gobbler I have ever shot (1.625" spurs, 2 beards one of the 10.5" and the other 6.25"). One thing I didn't like about it is the rear sight would get bumped loose on my 835. It was only held in place by a single screw that went under the vented rib. It had a tendency to slide some. I never have tried a red dot...