Troy, folding dioptic tritium rear sight. - Troy Dioptic Apeture DOA Top Mounted Deployable Iron Sight for AR-15

Troy Industries has a reputation for well made products. This sight is no exception. It works as advertised. The “diamond” / dioptic aperture allows for a far more precise centering of the front sight post when aligning the sights. It picks up easily with the eye, has a comfortable height and the tritium inserts lend tremendous aid to sight acquisition in low light scenario. The function of the folding sight is tactile with an audible yet not overly loud “click” once it locks into the upright position. The spring tension is firm yet not too difficult to manipulate with one hand. My singular gripe with the product is that it is not spring loaded to achieve its upright position. If it were, I would have given it five stars. Is that petty of me? Maybe... but there are other folding sights on the market of much cheaper quality *cough cough Magpul* that have that feature.