I'm a Range Officer on a fairly large state-run range. I observed a shooter destroy his Glock with Underwood "factory" ammo. It blew the right side of the receiver off and into numerous pieces. He was incredibly lucky to only end up with a severely bruised hand. In support of Underwood, they apparently owned up to a seating depth problem and replaced a number of destroyed handguns. At the time, that information was on their web site too. This was approximately a year or so ago.