Sarge Posted July 12, 2009 Share Posted July 12, 2009 Since I have lost one set screw out of my rear sight on my M&P I had a question or two about setting it for good. Which threadlock red or blue? I do want to remove it if absolutely need be but I don't want it to work loose again. Is there a trick to keeping the sight from moving while removing the set screw to put threadlock on it? Or do I just mark it somehow and be gentle until I get it tight? Link to comment Share on other sites More sharing options...
yoshidaex Posted July 12, 2009 Share Posted July 12, 2009 Red will keep it in but to remove it you'll have to use some heat (not colorful inducing heat). Blue would work also but I would check the tightness after shooting a few matches to verify it'll retain the screw before calling it adequate. Link to comment Share on other sites More sharing options...
Jhp147 Posted July 12, 2009 Share Posted July 12, 2009 Whichever you use, make sure it is not so much that it goes down into the firing pin plunger. Just heard about a case of that this week. Link to comment Share on other sites More sharing options...
B_Seehawer Posted August 11, 2009 Share Posted August 11, 2009 Whatever you do, DON'T USE GREEN!! Its wicking and will find its way into every crack and crevice. I'd personally use a tiny bit of red. Clean your threads out and go to town. ganderman Link to comment Share on other sites More sharing options...
Dan Sierpina Posted August 11, 2009 Share Posted August 11, 2009 Whatever you do, DON'T USE GREEN!! Its wicking and will find its way into every crack and crevice. I'd personally use a tiny bit of red. Clean your threads out and go to town.ganderman Only 290 is wicking, the others are not. Link to comment Share on other sites More sharing options...
Dan Burwell Posted August 11, 2009 Share Posted August 11, 2009 Use the blue, only put a little on the threads not on the bottom of the set screw. I had to replace a bunch of parts on one not long ago because the owner used red, then needed to drift the sight a little, but he couldn't get it to budge so he put the heat to it. The problem was with the plastic liners inside the slide they warped pretty good. 290 may be the only one listed as wicking but they all do it to some extent. I have seen red and blue go from the set screw the whole way down to the plunger, since I didn't do it I have no idea how much was used to get it that far, but it happens. Link to comment Share on other sites More sharing options...
scheirere Posted August 11, 2009 Share Posted August 11, 2009 I second what Dan said. Blue (242) is all you need provided you clean the threads with something like alcohol or better yet, lacquer thinner. If you get all the oil and stuff off the threads, it will hold much better than you ever expected the "mild" 242 compound could. Also, the threadlocking compound adds a level of corrosion resistance that will keep steel threaded parts from making a permanent bond! Link to comment Share on other sites More sharing options...
Will_M Posted August 26, 2009 Share Posted August 26, 2009 Are you threadlocking an adjustable sight? Or the factory one? Link to comment Share on other sites More sharing options...
Dan Burwell Posted August 26, 2009 Share Posted August 26, 2009 Are you threadlocking an adjustable sight? Or the factory one? The set screw not the elevation adjustment screw. Link to comment Share on other sites More sharing options...
Adrian_Sorah Posted August 26, 2009 Share Posted August 26, 2009 Could you just stake it? Link to comment Share on other sites More sharing options...
Dan Burwell Posted August 26, 2009 Share Posted August 26, 2009 Could you just stake it? Sure but that could be a real pain to get out when it is time to clean the plunger. Much easier to use a very small amount of blue loctite. Link to comment Share on other sites More sharing options...
SavageMOA Posted August 26, 2009 Share Posted August 26, 2009 Pardon my ignorance but the set screw is where now? Link to comment Share on other sites More sharing options...
Dan Burwell Posted August 26, 2009 Share Posted August 26, 2009 Pardon my ignorance but the set screw is where now? in the factory rear sight it is visible from the top, in an adjustable sight you have to take the verticle adjustment screw out and lift the center portion up to get to the set screw. The set screw is there to keep the sight from sliding out. Link to comment Share on other sites More sharing options...
Will_M Posted August 26, 2009 Share Posted August 26, 2009 Pardon my ignorance but the set screw is where now? in the factory rear sight it is visible from the top, in an adjustable sight you have to take the verticle adjustment screw out and lift the center portion up to get to the set screw. The set screw is there to keep the sight from sliding out. Is the rear sight sliding out a common problem with the M&P? Link to comment Share on other sites More sharing options...
Dan Burwell Posted August 26, 2009 Share Posted August 26, 2009 [is the rear sight sliding out a common problem with the M&P? not at all, in fact they are quite difficult to get to go anywhere from the factory. Link to comment Share on other sites More sharing options...
Sarge Posted August 26, 2009 Author Share Posted August 26, 2009 Pardon my ignorance but the set screw is where now? in the factory rear sight it is visible from the top, in an adjustable sight you have to take the verticle adjustment screw out and lift the center portion up to get to the set screw. The set screw is there to keep the sight from sliding out. Is the rear sight sliding out a common problem with the M&P? Don't know if it's common but mine lost the set screw and just about fell off before I caught it. There was nothing on the threads so maybe they missed the loctite step on mine. When I sent the gun in for FTE issues I had them replace the screw. They put on a new sight and gave me a few extra screws with loctite on the threads already. Unfortunately the sight they put on has a really crappy finish on it compared to the one they took off. But at least it's tight. Link to comment Share on other sites More sharing options...
Dan Burwell Posted August 26, 2009 Share Posted August 26, 2009 Don't know if it's common but mine lost the set screw and just about fell off before I caught it. There was nothing on the threads so maybe they missed the loctite step on mine. When I sent the gun in for FTE issues I had them replace the screw. They put on a new sight and gave me a few extra screws with loctite on the threads already. Unfortunately the sight they put on has a really crappy finish on it compared to the one they took off. But at least it's tight. That is weird, the screws they use have that nylon patch on them so they don't have to put loctitie on there. I supose they could have had a screw that didn't get the patch, but certainly not a "common" problem Link to comment Share on other sites More sharing options...
Sarge Posted August 26, 2009 Author Share Posted August 26, 2009 Don't know if it's common but mine lost the set screw and just about fell off before I caught it. There was nothing on the threads so maybe they missed the loctite step on mine. When I sent the gun in for FTE issues I had them replace the screw. They put on a new sight and gave me a few extra screws with loctite on the threads already. Unfortunately the sight they put on has a really crappy finish on it compared to the one they took off. But at least it's tight. That is weird, the screws they use have that nylon patch on them so they don't have to put loctitie on there. I supose they could have had a screw that didn't get the patch, but certainly not a "common" problem Hey Dan, I am sure it was a fluke. But it sure is funny now in retrospect. I was trying some new loads and it was shooting 2 foot groups into a hillside from the draw. Man I thought I sucked big time. I was going nuts until I just happened to notice the sight picture looking a little funny and reached up and slid the sight back and forth. Link to comment Share on other sites More sharing options...
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