the peep he has on his hawken is a williams but it is just the mane sight in the rear, nothing screwed into it so hole is fairly large. In low light the peep about disapears, so my original TC sights are actually better in low light. Kinda funny I think the original sights work better for me in low light than in normal light. I contacted TC and they didn't have much to offer, I asked about tapping for a scope and they said it would void any warranty on gun and that they no longer have a custom shop so they wont drill and tap. So looks like if I want to keep warranty on gun I need to find a good sight I can use. Anyone hear os XS ghost sights, they actually list a sight for this gun and have in stock. I'll try to contact them today and see what they have to say.