Promocop, there are several ways to possibly bring the weight into spec. First, the stocks on that gun are extremely heavy. Replacing them with some lighter wood or polymer ones would take a great deal of weight off. Second, if it has a full length guide rod, you could replace that with a standard spring guide and plug. Also, as mentioned, going to an aluminum or plastic mainspring housing will help. All of this could be done without permanently modifying the pistol. I'm not sure which barrel bushing it has but if it has one of the more modern, thick flanged one, going to a standard style one would remove a very slight amount of weight.