T’s right….when my TSS was stock, it was getting about 775fps with JSB’s and a pw setting of 10. With a 18″ barrel and JSB’s, (same pw setting) it was getting an average of about 850fps. Both these were run at a fill of 3000psi with the stock hammer. A heavier hammer with an agressive tophat setting can boost these numbers a bit. I now have a 24″ lw .20 cal barrel on it and its pushing eujins at about 960fps for almost 49fpe.