I have decided to pull the trigger on a POF P415. Now I have to decide which particular model. I know I want either a 16 or 14 inch barrel but then which gas system length, the 11SX, or the Recon model with the 12, or the new 9SX. This will be my range rifle, possibly some competition, and eventually will be going with me to work at the Sheriff's Dept. Which would you get?