TFS,
When a police helicopter pilot needs a gun...there will be plenty of them laying about on the ground....all one has to do is pick one up and get into the fight.
Last job of this sorts I had....we had a group of shaved apes in the cabin with all sorts of things that go bang....along with a GPMG in the cabin door. We were serious about speeders in that jurisdiction. One got arrested for improper parking and shot for speeding.
Aw....jes kidding about shooting speeders....unless you had nicked some stuff that glowed in the dark.