I finally broke down and orderd an upper from ASI in 300 SAUM. It will be a 24" barrel 1x12 twist with a Maxi brake. The barrel will be fluted front and back and bead blasted. It will have a quad forend. I have wanted one for years and I have read all I could find (not much out there)about these uppers and rifles. I have the DPMS 300 LR with a Timney trigger. I like it but I wanted the longer barrel and brake. I discuss with ASI the 7 SAUM and they said there were issues with pressure in that caliber. They also said 6 to 8 weeks for delivery. It will be a long range hunter.