Ok, I have decided to go with a A5 Buffer Tube set up, and my LOP is 13.5", so I need a shorter adjustable buttstock that can also accommodate The A5 Tube. of these I have zero experience and will be obviously going with a Mil-Spec Tune because I believe that is the only way the A5 comes. So, with that being said, of these and who has experience with each or all, please give me some feedback and which way I should be going. This Gun due to weight, will be mostly for precision shooting (Prone, Bench, Tripod) and zero running gunning.