Hmmm my dealer had 2 6940s in today I asked to look at one and etyh M4 feedramps were screwed up... They had a jagged edge at the top where the normal perfect squared cut is for the bolt to lock up?? So I showed the counter dude he pulls it and we examine number 2 guess what?? same problem he pulled both.. WTF is up with colt letting these things out of the factory I wish I had a camera but neither one of us had seen this before??