Just a quick note for anyone using nail guns. I shudder almost every time I watch one of the DIY TV shows, such as Renovation Realities, etc., where one of the klutzy amateurs is using a nail gun. Usually a framing nailer, too. They hold the bottom stock they are shooting into with their left hand, just inches away from the nail gun's head. An accident waiting to happen.
My Porter Cable 350 has double-shot more than once, sending the second nail all over the place. I urge everyone to use extreme caution and respect when using a nail gun, and keep your free hand well away from the line of fire. The life you save may be your own!