The mass is correct. It's all about anchor point. The use of a kisser and a peep forces you to anchor the same every time. If you can repeat that anchor w/out those, you'll shoot just as well. BUT, it's simply to easy to be off on your anchor the slightes bit. If you are anchored even 1/32" differently, your impact point will change dramatically. Leaving you to wonder what in the world went wrong. Personally, I feel like one or the other is sufficient.