Ok i recieved my MP7 today with the hi cap.
The hicap feels really solid and even though its plastic, it has the cold metal feeling to it. Or is it actually metal??
I didnt have any jamming problems at all, and i needed to wind it twice per mag, so theres the intial wind, then the final wind before you empty the mag.
A few BBs stay in the mag after you finish using it (20 according to the lil manual).