I put a Ratworks cylinder on my HW100BP, lightened it up a little, my HW100BP and HW100T .22's are tuned to 780 Fps with JSB 18's, very accurate, my HW100TFSB .20 is tuned to 800 Fps, very accurate with JSB 13's, I have a homemade moderator to bring the volume down to a puff and a HW100tuning...