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: What make gun is this sight for?
Document: I bought these for my son to add to his Ruger Mk III pistol.They work great. Much easier to pickup the front sight in when shooting at the range.They installed with the factory site hardware. Takes only a few minutes to replace factory sites.Make sure you use a screwdriver of the proper size....
This is the second Williams Gun Sight I have installed on a Ruger Mark III pistol. I am very pleased with the improved sight visibility. As with all light gathering sights, these diminish in effectiveness as the light dims. They outperform the original stock sights.
these sights make finding the bulls eye on black ring targets and silhouettes much easier. one thing I would have preferred (and why I gave it 4 and not five stars) is a replacement front sight screw for the ruger mark series, as I nearly destroyed mine trying to remove it. other than that they worked perfectly, even at the indoor range where the lighting could be better, they are very bright.
I put these on my Ruger 22/45 lite. My first shot accuracy improved greatly, and my multi shot groupings became much tighter. My tired old eyes can focus on the target and I can see the dots clear enough to align them up properly.I only have one small nit of a problem:  I have the picatinny rail that came with my gun installed, and I sometimes like to put on a red-dot sight, so I did not want to remove the rail.
These are great..easy install and look awesome..I will be buying more. Highly recommended for anyone who owns this gun ...
Excellent customer service, very friendly and professional to deal with, my sights came in sooner than expected, fit perfect on my gun, and works perfect, I sill defiantly buy from these guys again and would recommend them to everyone! Keep up the great work. These sights are high quality and accurate just as described!
good sights ,an works well , they are very bright and it is easy to aquire a sight picture , from close and far away def better than original sights
Excellent sight picture. Be sure to use a close tolerance screwdriver to remove and install the front sight. I also used blue locktite on the front sight screw.
These sights are great for indoor use compared to the old factory all black iron sights. They were easy to install and also easy to sight in.Yes, I would recommend them over the factory ones.
Fairly easy to install , item as described , shipping was fast however I'm unsure if tubes are replaceable ... I've only had one range trip , not sure if I'm satisfied with rear sight at this time ...
Answer: yes