I asked a question on another forum on whether to get a Colt LE6920 for $1095 or a Rock River Entry Tactical for $800 and the overwhelming majority opted for Colt. They said that the work around the buffer on the Colt was better and what not. So, my question is, are the reasons that people chose Colt over Rock River legitimate or not. I guess what I am getting at is that I don't hear any Rock River or Colt owners complaining about malfunctions, etc. so is there really any difference between the two rifles other than price and the buffer or whatever? Also, what is the buffer and the parts that everyone is talking about and do they really affect the performance, durability, and reliability of the rifle? Thanks.