Not to bash, but I see that a lot of guys have had problems with things vibraing loose. Customer service seems good at resolving issues. That's what they are for. But the other side of the coin is, they have to have good service if they want to keep selling sights. The thing is, why don't they start making them out of metal so things can be tightened down without rattling loose? I always buy sights made of machined aluminum, such as Sptt-Hogg or HHA Optimizers and have never had to bother their customer service because they built them right to start with. And, I've had a few plastic sights over the years with pretty much the same results--always coming loose.