Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: I received my Magpul rear sight and everything looks great except the Aperture is crooked (leaning to the left). Is this normal?
Document: I expected this to be great being from Magpul and I wasn't dissappointed. I was leaning toward a steel pop-up sight, but read a review where a rifle was dropped on various sights and the metal ones bent and the Magpul polymer sight took the impact and didn't affect zero. Amazon has a great price on these and the quality of the sight was everything I had hoped. This is no counterfit part.
Sight goes on easy. Very useful and looks great. Material is very durable. Certainly would buy again. And I received it right on time.
I have an AR that has a fixed front &#34;F&#34; marked sight. It came without a rear sight. While I normally use a red dot, I needed a back up method of sighting.Magpul has a great reputation for providing quality at a reasonable price. I'm sure you can spend 3x as much and get a sight many would rave as being &#34;superior&#34;, but this sight does everything it's supposed to do at a great price.
After doing my research on iron sights, I found out using both front and rear magpul would be off way high due to the lower gas block on my DPMS. So I ordered a promag gen 2 flip down front sight, then ordered the magpul MBUS. I went to the range and from 30 yds I was grouping 2 inches right from the bullseye, just a couple clicks left on the magpul rear sight, and BOOM right on target. Great sight
Like almost everything Magpul makes, this is a great product, especially for its cost. I do not think it is the best BUIS available for purchase, however, I think it is by far the best available for the cost ($55). I have owned and used cheap $25 UTG back up rear sights and I have owned and used $125 Troy rear BUIS.
Great design, Easy to install.The only thing that kept it from being a 5 star for me was the flip down aperture in the sight to go from a fine to a broad site was so stiff I needed a screw driver to pry them apart. Not that I would ever actually want a wider.It is well made  and looks like it will last the life of my rifle.
I am new to magpul, but the flip up sights are spot on. I had them zeroed in 12 shots. They seem to hold zero well, have rapid fired it after zero and they maintained zero. The rear flip sight they offer lines up perfectly with the A2 front sight post. The sight is impressive for being polymer and only around 50 bucks.... Fit, function, and looks get 5 star's from me. Great product magpul, will buy again.
Not going to pick this product up at your local China Mart store. the Magpul rear flip sight is made with good old American know how, sight was easy to mount, great spring action in just one touch to lift sight, the sight aperture has settings just like the iron sights on the carrying handle, just with this the aperture can flip from small hole to large hole for ranges or for firing in Protective Mask.
Being that I didn't plan on mounting an optic any time soon, I realized the need for a quick deploy rear sight. That's why I purchased the Magpul Gen 2 MBUS rear sight - and for my usage - it's absolutely perfect. Everything about the sight screams quality. It's quite heavy for polymer, which I wasn't expecting, but still shaved some weight off of my AR (all Magpul MOE furniture to keep it light).
I've never had a problem with Magpul products they have always been dependable. I wanted this rear sight and matching front sight to go onto the picatinny rails of the Archangel 5.56 stock for the Ruger 10/22. They attach firmly to the rails. I aligned the sights using a laser bore sight at 50 feet. A dial on the right side of the rear sight easily makes adjustments to the right or left. It's very easy to use, a few clicks to the right and I was done.
Answer: yes