check the area around the rail for rocks. I got a good gouge in my a-bangs from a rock hidden in the grass.
Luckily they have very thick bases. so the deep ass gouge still wasn't a core shot. Just filled it up with petex and kept going.
And why does everyone hate on the Afterbangs? sure they're a little heavy, but they are fun as hell to butter, and they're mad stable on rails.