Yeah, "Sight Tracker" is just SVI's terminology for the technology that keeps the front sight stable and not moving relative to the barrel.
It supposedly allows for faster sight pickup since it doesn't move. It allows you to "track" the sight. oooooo.... clever name.
I have a feeling it's epoxied on, as there are no brazing marks.
Anyways, we'll see what happens with this. If it breaks, I may be forced to bond it back on with a compensator on the front to create a 5th lug.
