I made that mistake you asking for it here.
Not an M3 but a heavy upgraded MK2 ... I bought the PowerBlock kit that came with a larger 720c plenum (which upgrades the MK2 to M3), but also bought separately the tungsten hammer weight.
After the install of the 14 gram tungsten I had to pump up my Reg to 170+ bars - to get the Hammer Wheel showing basic speed fluctuation when turning at 1-2-3 but nothing changed when I was turning up towards the heavier spring tension. The total weight of a hammer was just hitting way to hard.
Removed the tungsten and put back the 8 gram brass weight with 3mm longer spring ... still the hammer was hitting hard.
Ended up removing all to stock FX 6gram weight and 52mm spring, and now the hammer hits a full selection on the wheel (from 1-16) at 150 bars.
That 150 bar on the Reg is more then plenty speed for pellets I could comfortably go lower pressure, but occasionally I want to shoot slugs beyond 100 meters, with this same tune just by selecting the wheel.