In theory, the most straight forward way for a power upgrade is modifying the gas system. Think of gas as water – the more water you have, the higher pressure you can generate out of the water. If the water level runs low, water pressure drops accordingly. The same holds true for gas. The first few shots are usually the most powerful (if the temperature is right) because the gas pressure hasn’t drop. Subsequent shots are getting weaker and weaker, until the gas runs out. Therefore, one logical upgrade option is to extend the size of the gas reservoir. You can hardly do it manually – ask your local dealer and see if upgraded mag with a larger reservoir is available.
Some people with strong mechanical engineering background like to modify the reservoir themselves by extending it upward. If you have the necessary tools and machining techniques, the above approach is technically possible provided that you don’t extend it upward too much. Remember, gas is further pressurized when moving into the gas passage. When the reservoir is extending upward, the lower air passage has to be cut short. An air passage which is too short may not be truly beneficial performance-wise.
