If it is disassembled you should be ok, but the old rule used to be that if it was blocked to no more then 15 it would be OK. Supposedly the State Police have made a ruling changing there minds on this issue, supposedly the mags must be permanently blocked to be legal. If the guy is an LEO none of this should make any difference and you should be able to ship to him with no problem. The real problem is not for the person shipping the mags it is for the person receiving the mags. Just make sure he pays you first [:D].