The Airsoft Revanchist shows the new Brass Spring Housing For the Hi-Capa Series. According to them, it is heavier than the original by 50% and the centre of gravity has been changed to the grip side. They says it has better accuracy and comes with 80% and 120% hammer spring.

Quick look video by Airsoft Revanchist of the Brass Spring Housing For Hi-Capa Series. This is 50 grams heavier than the original and there is a change of Center Gravity to the grip side. It is said to effect better accuracy and comes with 80% and 120% hammer spring. This should be available at airsoft retailers in Hong Kong.