I've been using a 2008 model 762SD for about a year and a half on an 18" Noveske N6 with AAC blackout, Steyr tactical with 24" barrel and AAC blackout, Colt 7.62x39 16" with AAC blackout, and Rem 700p .300WM 26" and AAC brake. I really like it. Before I tried it on the .300WM, I called Mike...