Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Will these sights work on a flat top upper with the front sight mounted on the gas block using a red dot sight for co-witnessing
Document: I got these as a back-up to a red dot sight set-up on my AR flattop. Fast and easy to set put on, but I would strongly suggest that you get an AR front sight adjustment tool. I was struggling with it until someone at the range loaned me one.
Just got them in the mail today. First off came 3 days early so I'll take that. Now I pulled them out they are very durable feeling sights. I have the vortex strikefire red dot and got these to go with perfect cowitness set up. They pop up nicely and fold down solid. I can't wait to get them out and see how they all work together and sighted in. For the money you can't go wrong.
I mounted these on my AR15 today and am pleased with the fit, finish, and overall quality of these sights. They mount tight and seem very secure although I may have to use Loctite later we'll see. They are light and sit fairly low in the folded position. Hit the release button and they snap right up and lock into position, the spring seems to be pretty strong. Hit the button again to fold down. The front sight functions just like a normal fixed sight does.
These sights are high quality made. Anodized aluminum and very sturdy. They mounted up on my rail perfectly. Great back ups. Tje rear aperture has two selective rings which is great for whatever your using them for.
Nice sights. Know that they are single plane sights and I had to order a YHM riser to shim the front sight up. I really like them. They hold zero well.
Not the best and not the worst. These sights fall somewhere in between. The sights mount and flip up as advertised.The rear sight apertures are machined wrong leading to a halo effect. The small peep hole is machined with the bevel facing away from you. The larger one is fine and is also the default sight when your flip them up. There is very little play in the rear sight.The front sight has some lateral play in it leading inconsistent shot groups. This a a same plane sight.
These are great sights. They are well made, mount easily, hold tight, and easy to dial in. I don't have any of the lay-flat problems someone else experienced. Nice springs and no slop when stowed or deployed. Only thing I would like to see is a way to lock down the windage adjustment screw on the rear sight, but I'm still more than happy with what I got. I especially feel like I got a deal when considering the price.
First two sets were perfect, had to lube the third seperately purchased set, which fell apart (front sight anyway). You get what you pay for I guess.
The rear sight was ok, but the front sight did not mate with the rail on my rifle well and was in general poorly made! I don't know if mine was a fluke or they are all this way but I was not happy, even with the cheap price they should have been somewhat decent
The rear sight has the flip up peep sight just like the fixed sight does. My only complaint so far, and one that I can get used to, is you have to fold up the peep sight when you fold the rear sight down or else the peep sight will hit the top of the receiver and it won't lock into position. The rear adjusts for windage and the knob clicks as you make adjustments.
Answer: yes