The Twilight aperture makes quite a difference for the rear sight, but a Firesight up front make the biggest difference, both make a good combination, the hooded front sight is a poor choice for low light. Seems to me one of the members went with a different front sight for his BC for hunting, I'll see if I can find it if I can remember who it was!!

The aperture threads are pretty standard, I have em left over from my Lyman 57SML sights that work fine in the WGRS, I don't recollect the size right off hand tho, I use a larger target aperture with a tiny hole for range work, it takes some of the eye variables out of the equation so I'm testing the rifle, not my vision!!

Tim