My brother still lives in New Jersey. He bought a M&P 9mm back when the two extra mags were being offered. What I did what had him send the two extra magazines (17 round capacity) to me since he can't have magazines with a capacity greater than 15 rounds. This problem has reared its head again since I have a pistol with a 16 round capacity I'd like to bring up there to shoot. Has anyone ever blocked a magazine like this? His can be more permanent but I'd like mine to be brought back to its full capacity when I leave that place. Any ideas?