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 fit s&w model 439
Document: The rear sights do not fit properly. They are too loose and do not grab the slide set. Even with lock tight they still need something to eliminate spacing. Besides looking great which is why I gave 3 stars the parts should fit the weapon. No one should have to do anything besides using lock tight to secure parts.
I did a lot of research on these night sights vs. the trijicon vs. the truglow. I ended up purchasing these and I have to say I am beyond impressed. The glow-in-the-dark quality of these sights is amazing - crisp and clear and bright (and permanent). The day-time sight quality is also fantastic. The spacing in the rear sight is a perfect fit for the front sight, so there is very little float and accuracy is excellent.
The front sight installed easily, just as expected but the fit of the rear sight was loose. I had to drill a hole and install a set screw to secure this sight on the slide. I would have expect the sight to fit much tighter but adding the set screw makes the sights adjustable so I guess all is well. The glow of the sights is nice and they definitely look much better than the factory plastic sights.
This is actually what I was looking for. No outside power source needed.The only problem on my gun is that  they are lose had to wedge some aluminum shims under them to make them fit. They need a set screw on the rear sight , but I have no way of ding that to where I feel comfortable doing it.
Yikes!! All was well after I found a better pair of pliers, heated the screw up with a propane torch, and got the sucker in. NOT FUN. I thought I had trashed the sights, but am grateful for ability to think under pressure. Heed this warning, buy these sights, and enjoy! They are worth much more than they cost.
These sights are very bright at night and are as good as the more expensive ones. The only issue is mounting them. They recommend a glue that is very hard or impossible to find locally. You would think that the cost of these sights they would come with a set screw installed in them. I installed a set screw and have had no issues with them. Do put thread locker on the front sights because they do work loose after shooting some rounds.
The Meprolight, Smith and Wesson Tru-Dot Night Sights for the Sigma series SW9VE are excellent night sights. The only thing you'd have to worry about would be your adversary coming up from behind you, in which case he/she might see your sights. They are bright. Not to the point of glaring, just comfortable. If ever there's a chance you might take a shot in the dark these sights will line you up with your target with assured accuracy.
I absolutely LOVE this set of sights. Well made, really nice contrast both day and night, perhaps the front sight dot could be a little larger so it looks the same in the sight picture. I really don't think there are any better. However, the screw that holds the front sight on is difficult at best to put in. You should use the Loctite they recommend, and nothing else.
I installed these same sights on my Sig and they work great so they should work extremely well on my S&W. Be aware that on the web sight and on the packaging it says for S&W SD series but that is incorrect. The front blade type fits the older Sigma series, not the dove tail SD9VE series. I am in the process of exchanging the blade front sight for the dove tail front sight found on the S&W M&P9 series.
You won't be disappointed.
Answer: yes