Aftermarket LMT front sight nut...

[billybronco]

There was a thread that mentioned the thread pitch but I can't find it.

I'm running my X300 at 12:00 and need a more low profile nut.

[blake-b]

I can't remember the size either but it's very common and can be found at home depot or lowes. When I did it, I took the sight in with me after I twisted the knob off, cut the end off and cleaned up the threads.