I just took all the Butlers off my rifles. I am sick of them. They are cheap and flimsy. The front objective has to be tweaked ever so carefully to get it to stay closed all the time. The rear cap is always in the way on a variable power scope like the NightForce where the entire eye piece moves when adjusting power. As flimsy as these things are, I'm shocked that nobody else has stepped up and offered a more durable product that's available for all scopes, not just Leupold (aluma caps).