Pre existing threaded holes in trigger-bar

I have a new talon and after reading threads about trigger mod’s and looking at my rifle I have found that there are two pre-existing threaded holes in front of my trigger in the trigger bar. One (most foward) that’s apparently for the over-travel and the other is just in front of the trigger dead center a spring. Both of these holes are threaded. For the life of me… I can’t figure out what the hole in front of the trigger would be for. Any ideas?

JD