Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: If I am mounting this on a A3 upper and need a rail mounted front sight. do I need to buy a particular front sight to make sure my front elevation is at the correct height so the ranging works?
Document: This sight works great, holds solidly to the rail of my del-ton upper and was pretty quick to sight in. I doubt I'll ever aim at anything past 200 yards with this but it's nice to know the sights are capable even if I'm not.Very well built, takes a surprising amount of force to flip the sight up.
Even when flipped down, the sight sits significantly high off the receiver (.75+ in). It nearly impedes me from using my magnifier; that said, I'm sure people with larger scopes will not be able to use this at all. So I guess it is alright to use if you do not have an optic, but then why do you need a BACK UP iron sight in the first place? It is also rather long, taking up to SIX picatinny rail slots.
this sights are excellent for the money, knobs are crisp. just make shure you get the appropriate front sight or you will have to be zeroed at 300y like in my case. it should work fine with fixed front sights.
This pop up rear sight is a must have for anyone with an AR that has the standard front sight on it. Its one of the few items I've used made for the military that exceeded my expectations. Follow the mounting and zeroing instructions and you will have zero problems.I was very please with the speed I received it. I ordered it late one Friday night and received it in the mail on Monday
it is a precision piece of equipment. For the price, how well it functions, and the fact that you get the added feature of ranging, makes this sight my choice. If all you want is close range you may not need a sight, but if you want to reach out there and touch something, with accuracy, this is the sight for you!
Professional grade iron sight, very decent price as I have seen them as much as $150 elsewhere. Fits nice and tight on a AR15 flat rail, great for 100+ yard shooting. If you are not planning on scope shooting and want a durable iron sight setup this one is for you. If you just want a basic back-up sight you might want to spend less and get a cheaper quality sight. I would buy again for the price. You won't go wrong with this iron sight.
works as advertised, good product overall it is just like the setup I had in the military. it is a good buy.
I got the site in the mail really quickly. It was an exact fit onto the metal piccitanny rail, and then I tightened it down where I wanted to keep it. I had the same one in the Army. Good buy.
Awesome ranging rear sight for a picatinny rail,  this is the best that I've found that adjusts for distance of a .223. The rear post with the peep flips up and locks into place firmly. The sight has a large lever on its side that you can rotate to distances marked on a scale, from 100 to 600 yards. As you rotate through the scale you can see the post with the peep sight move slightly up and down.
It works well and nests neatly folded under the objective eyepiece of my scope which is mounted in a Burris PEPR mount. I was looking for a rear BUIS that would fit under this scope and this one is low profile enough to do that.
Answer: yes