Pocket... Infinity? Did you mean Perun's Fire? I mean, if it's Pocket Infinity I go for Range > Impact. I don't notice the Impact at all, so Smooth Ballistics all the way! If you meant Perun's Fire I recommend going all Range, preferably with Hip Fire. The reason for this is that the Vendor Light/BEWARE already has a stellar Stability build with Rangefinder that compliments an ADS heavy playstyle, so it's somewhat redundant to go for Stability on Perun's Fire. Also, the charge rate shines the most at close range while highly mobile and hip firing.