Well my brothers ak47 is at roughly 410 fps with a .2g, but when using .3g matrix bb's(I really like them because they compare closely to ksc bb's) it had a lot better accuracy, and only slightly less range then it did at 550fps. It had perfect compression with a stock g&g tightbore barrel, stock g&g metal ak hopup chamber, with a prommy soft bucking and white h nub. Everything stayed the same on both setups besides the spring, gears, piston and fps. My question is why would the accuracy go down at a higher fps with the same exact setup, and I know how to achieve 300ft shots require high fps. But my 550fps setup got very similar results as my 410fps setup. So I do not understand how 300 ft shots are really possible though I know they are..