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: 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: Maybe the military loves it, but I sure don't. The major advantage to it is the ranging elevation feature, which is actually a pretty good thing. The problems start with the installation. Instructions say to turn the screw in by hand until tight, then turn it a further quarter turn. When I did that, it was still loose enough to fall off after firing a few rounds. When I put some torque to it, the screw snapped, rendering the sight permanently useless.
The Matech BUIS is the BUIS used by the US Army on their standard M4 Line Weapon, and if you get one you'll know why. This in my opinion is the sight to get, and the only one you'll find on any of my M4/ M16/AR Platforms, adjustable windage and ranging keeps it pretty simple with all your adjustments being at the rear, no more screwing with the front post.
Just like the one used by the military. Easy to use, sight in, and dead on accuracy. Would buy again.
Brand new in package and exact same as my M4 at the armory...why not go with what you know that works?
the price was great, almost half of what you should be paying, and the delivery was ahead of schedule. Great Buy.
Looks and works great, it is identical to the BUIS on most of the newer military issue M4's these days.
I Had one in military, lets see how this holds up- then again, I take care of my gear..good so far
Product as advertised! I battle sighted it in at 25m. Easy to use and looks great. Sights in quickly and easily. Only thing I would improve on is making it dual aperture.
Had recieved one from Afganistan. After cleaning all the sand out and making minor repair got set up on my Spikes Tactical. Good reason the U.S.ARMY is using these. They are awesome, my boy hi-jacked it from me, it did come from his friend anyway. So when I found these for $59 on Amazon I couldn't pass it up. Other outlets sell for up to $150, bought one months ago for $85.
Cant go wrong with this BUIS. Had this sight on my M4 while deployed overseas in the military, recently purchased one for my custom AR15. This sight has never let me down. Good, solid product.
Answer: no