October 30, 2012, 10:33 PM
Had to pull the barrel on a DPMS today, one of the uppers with no dust cover. Anyway, my Brownells upper vise does not fit these receivers properly. Some smiths have reported that they use a barrel vise rather than a receiver vise so I tried it. Bad idea! Instead of loosening the barrel nut, it sheared the barrel locating pin. Finally got things fixed up by minor modifications to the Brownells vise. Lessons learned, 1. Don't use barrel vise, 2. Buy DPMS receiver block.