It is a sports type chamber. If you replace it with the normal one, the mid-low speed will be improved. The volume is not noisy. It will be larger than normal. It doesn't bother me. Grand Axis 100 BW'S100 <> Sports type chamber. If you replace it with the normal one, your medium and low speeds will improve. The volume is not too loud. It will be larger than normal. It doesn't bother me.
