1877 Front sight

[HWPete]

Try purple lock tite. It's designed for fine screws that you may want to adjust. I had an adjustment screw on a C Sharps SST that kept walking; purple lock tite and it hasn't moved in ~6+ years

[patchbox]

Yeah, looks like the purple loctite would work well.

[Randy Bohannon]

Purple loc tite if and when it happens again, not until I get my 200 yard dead wind zero .