The bit about spooking and being easily knocked off zero makes me think you're thinking of a laser rather than a red dot sight. The reader just means a low 1.0 - 1.5X powered sight that you look through and past with both eyes - you see a red dot in the distance due to your binocular vision. The sight doesn't actually 'project' a dot if you see what I mean. The Swedish company 'Aimpoint' was one of the first and most successful exponents of these sights - their unique selling point was being parralax free (though some of their recent sights aren't at very short ranges - you have to keep the d