What color loctite for Glock front sight

[MWAG19919]

Today at the range I noticed my G19 front sight coming loose. It's a Trijicon HD that I installed ~4.5 years ago. To be honest I can't recall if I put Loctite on the threads, let alone what color Loctite. The pistol has been fired 6k-7k rounds since sight installation, including a 2 day 800 round class, so I'm a bit puzzled that they came loose 60 rounds into a range session.

I got the gun fairly warm today doing double & triple taps. Certainly not full mag dumps.

I'm going to clean the threads really well tonight and apply thread locker, but I'm not sure what color. I'm thinking red. Anyone have advice?

[Chameleox]

I put blue on mine 4 years ago, with no issues.

[SomeOtherGuy]

I have a similar issue with my own G19 and a Truglo TFO front sight. I used Vibratite VC-3 when I installed it 6.5 years ago and it just came loose. I guess I will try Loctite this time.

[signal4l]

I use red. Hold a lighter on the screw for a few seconds if you want to remove sight

[donlapalma]

Blue. No issues on 3 glocks. Thousands of rounds.

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[MountainRaven]

Red is what I use.

[1oldgrunt]

red is "permanent" meaning you will have to heat above 650 degrees to remove

use blue it is semi-permanent and doers not require heat to remove

[teksid]

I always use Red. I use a heat gun to remove.

[ggammell]

Blue keeps it in but is no sweat to remove with the front sight tool.

[MWAG19919]

I ended up using a big drop of blue, but I'll keep an eye on it. If it somehow loosens again I'll hit it with red