Did some testing with an enemy player on how glint handles.
It seems all scopes/sights have glint at the moment, though I'm assuming this is a bug. However, glint on the 1x, 3x, 4x, and 5x (that's what I managed to test before the game ended) have no glint under 100 meters or so. I have seen glints at closer ranges than this, and assume that some scopes (maybe the 6x?) have glint below 100 meters.
I've managed some silly games with a 4x, CQB suppressor and the DLC bolt. Paired with the fatal headshot, you can be an absolute menace, even on the smaller maps. From memory I managed to top around 40 kills on Iberian with this setup, and it feels quite busted if I'm honest.