Hi guys first off I hope that im posting this question in the right forum. I have a new Mossberg 535 with a 22 inch barrell 12 gauge. I shot the gun with the factory fiber optic sights and it shot about 5-6 inches high of my point of aim, thats the reason for buying these sights. I was wondering where I should place the sights on the rib and also what size is the rib width? I have one last question, I noticed while I was shooting the gun that I got some pretty bad cheek slap! so my question is do you think these sights being a little higher may help with this problem?? THANKS FOR ALL OF YOUR HELP!!!!