As a guy who runs an Eotech 552 on his work rifle because that is the way it is configured I recommend you take a good look at the Aimpoint Pro package. Don't worry about lens size, it isn't about looking through the tube like shooting a scope, it is about seeing the dot with both eyes open and superimposing the dot on the target, after a while of shooting a red-dot you'll stop cleaning the glass because it just doesn't matter.

