The regulated version increases the consistency and efficiency of the pistol, the direct effect of bringing a regulator into the equation. However, notice that the unregulated GK1 is already a quite consistent gun despite being unregulated. The regulator also allows the power of the GK1 to be tuned down further than with the unregulated version. Being unregulated, the GK1 at full pressure can only be lowered so much, while the regulated version can keep the pressure at constant levels, meaning the first shot until the last (when you reach the point you have to refill) will shoot at almost identical power levels.This allows the GK1 V3R, the regulated version, to be set to sub-6 FPE, as the laws in some countries require. The original, GK1 V3 can’t get that far down in its first shots.