I purchased a DD Upper and DD BCG back in 2010 from Smartgunner.com and the order was sent to DD and DD built the upper in house and shipped it with a DD BCG directly to me. I also bought a DD lower in 2010 from G and R Tactical. Recently, I was at an all day Carbine Class. Unfortunately, my DD ar-15 had double feed issues all day with Magpul Generation 2 magazines. I tried 5 different magazines with all the same issue. I even tried my magazines on a friends gun and found no issues. Two days before the class, I completely disassembled and cleaned by BCG as well as cleaned the inside of the rifle, hoping to prevent any issues from a dirty firearm. I kept lubing my BCG during the class but by the end of the day I couldn't run any more evolution's with the gun as the Double Feeds would happen constantly. Any idea what could be causing the issue?
I have emailed Caroline but have not heard a response.
Any help would be appreciated.