Excellent rear sight - Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight

I have used the Troy fixed sights on a couple other rifles and have been very happy but this is the first time I used the Di-Optic aperture... I am very impressed with the large aperture... it is diamond shaped with a vertical and horizontal line on the border... it makes it very quick to get center... I tried some rapid fire shots at like 50 feet and instead of the normal 6 inch group I was putting them in about a 2 inch group... The small aperture is not a full diamond... it has about a third cut off the top... I think it will work just fine but it make take a little getting used to.