I shot a HHA for a couple years, they are a great sight, I had a 1 5/8" single pin with the crosshairs, I also used a 1/4" peep. When I looked through my peep there was a little space between the sight scope and my peep but not too much to ever worry about. You could always go with the 2" model and just try different peep sights till you find one that fits tight. The Blade armor on the sight pins are nice too its really hard to bend the sight pin. I ran over my bow with my jeep, and the sight was bent bad but the sight scope itself is still perfectly fine, HHA sights in my opinion are tough and they have a lot of variety you can get 2'/3'/5' of fiber optic in a single pin sight.