HI ,
i have an M3 chrome same as yours with a spring over the magazine and whithout a spring inside the rear stock ; but i have a friend that has an M3 with a rear spring inside the stock and whithout a front spring and his gun is much smoother to operate and makes no noise of spring .
i did not shoot both together to evaluate yet but i think his gun would give less recoil ?
if i could i would change my bolt and install a spring in my stock and get rid of this front spring .
TAREK