I just got a barrel in and the pin that keeps the barrel from spinning in the receiver is so tall it sticks up above the threads on the receiver. Can i just file it down? I assume that is a step they missed in building the barrel. Can I pull it out with vice grips or something and file down so as not to effect the hole it lives in? Or should I just run a few passes with a file as it sits? I contacted the builder but I bet I don't hear from him until Monday.