I should add that the TM Hi-Cap mags have feed issues (at least the ones that came with the gun in Japan). Often due to the weak(ish) tension of the wound-up spring, it will mis-feed. I had to buy new hi-cap mags in order to get mine to fire properly but be prepared to keep winding those suckers until the game ends cuz when this thing fires, it's like shooting a white laser.
Insurgent Attack against U.S. Marine Forces - YouTube