you can try macro 16, micro 3.2 , valve just less than 4 ( 4 ring not visible ), Reg 1 150, Reg 2 90 , standard pre powerblock M3, 600 mm barrel, perfectly tuned for 50 m with 1/2 in group @ 890 fps this may be a starting point for your tune ( adjust the valve very slighly and shoot mininmum...