I pulled out my ATI Nova Liberty the other day and, for the first time since I was in the service, shot open sights to 25 yards. I surprised myself and did better than I anticipated. The Liberty's sights are decent, but certainly not very precise. The receiver and barrel band both look like they have 11mm rails so I'm thinking about pushing the envelope, getting better sights and shooting longer distances. What's a reasonably good distance? What's the furthest you've shot open sights? Any tips?