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Old 07-13-2018, 09:14 AM

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Absolutely Blue!!!! Barrels are not hot enough to melt the lock tight.

Red will glue it on permanently.

I have a mark II I bought used in near mint condition. It had the tendency for the rear sight shaft to wander out. I put a dab of blue on the end and it stays in now. I was careful not to over do it and gum up the rear sight.
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Old 08-26-2018, 10:47 AM
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I had the front sight come loose after 400 rounds on my Mark IV tactical. It was loctited, but there was oil residue in the threaded holes. I cleaned the threads very thoroughly with alcohol and acetone, and used Loctite 242 (blue) when I put it back together. Itís critical to make sure that the threads are clean when you reinstall the screws. You only need to fill the first 2 or 3 threads on the tip of the screw. On small screws, using a toothpick dipped in the loctite will help control the amount you are applying. Iíve put 4000 rounds through it since then, with no problems.

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Old 08-28-2018, 02:59 PM

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Originally Posted by rfaddict View Post
Before going to Loctite of any strength, try cleaning screws and tapped holes with acetone and applying bow string wax to screw threads. It reduces vibrations, prevents galling and has worked for me over the years on everything but a scoped 629.
Thanks for the idea ill try it out
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Old 08-28-2018, 08:03 PM
jon p
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i am using purple now

not easy to find, does a great job and easier to remove.
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