Knocking down doors might be better suited for the 14 inch which I wish I could more easily collect. I agree its a bit overkill so to speak, I have used this sight at the range and it works great and easy to zero. Its bullet proof again - so to speak, and makes the weapon almost too easy to aim, like cheating or no-brain-er compared to the irons. There is unlimited eye relief, but you do have to get on the sight which is very quick even with the stock in the first position, closed stock is awkward even with it out front on the rail. It also removes easily, so I also used it on my 15PC before getting the IOR 2-12. I am aware of said weakness of the stock rail and any added effort over smaller more compact sights which would likely make a better permanent mount. The 8 (night sight) and 8 red dot settings are great for adjusting size of dot and complement the tritium night sights made for the M4. I will let you know how it works out.