This is for people who have a confident answer and not just some guess. I'm looking into this as a secondary and I'm hesitant on issues concerning its fps. I'm not questioning its range but we have people (local) that wear too thick clothes to fell anything below 350 fps (according to them). I was hoping through either internal modification or longer tbb that this could be in the mid 300's reliable. My guess is that the barrel is too short for higher fps because of cylinder to barrel ratio. Thus possibly needing a longer barrel with suppressor. This is my go to option if someone can chrono prove this being the case. I just don't feel like pushing the internal limits trying to have a heavier spring. Granted I would re shim, sorbo, aoe, radius and air seal mods if I did open the gearbox. My only concern is, is that I've never dealt with anything mid-high end gearbox other than v2 and v3. Please share your knowledge as I've tried to find more info with it coming out soon for $75 at evike.