First let me say say the speed of shipping and customer service from Muzzle-loaders.com was excellent. I'm sure they could have resolved this issue if I'd had time. I bought this sight for a last-minute CO elk hunt. Unfortunately the factory T/C front sight on my Omega is too tall. When elevation was adjusted almost off the sight I was hitting 3" low at 50 yards. Ended up sticking with the factory iron sights. From a web search this is a known issue by Williams they choose not to address.
With the flat base that overlaps the flat on octagon barrels with only one screw there is nothing stopping it from turning if bumped.
I have not yet installed this sight on my 223 contender carbine but the same sight on a 10 inch 44 magnum contender barrel I have is great. Thanks for the opportunity to comment.