So what's the reasoning for a single groove?
Maybe to improve bedding of the rear tang? There was never much surface area there for bedding.
I have 2 AAC's, one 223 and a 308, one has a C stamp on the bottom of the receiver, the other an S...took me a while to figure out what they mean lol.
C=carbon S=stainless. I guess black oxide works equally well on both materials, and someone grabbed the wrong one somewhere along the line.
Are you saying that one of your AAC's is stainless?
Maybe to improve bedding of the rear tang? There was never much surface area there for bedding.




























