Apparently some 30 MP5s have disappeared from the LAPD arms locker. And LAPD spokeswoman is saying they were MP5s altered to fire blanks. This didn’t make sense to me, because I thought you only needed a blank firing adapter on firearms that needed gas pressure to cycle the action. The MP5, as I recall, is a roller locking, delayed recoil mechanism. Can anyone who’s an expert comment on this? Can you fire blanks from an MP5 unaltered? Even if you need a blank adapter, I can’t imagine it’s difficult to remove, as is claimed by the LAPD spokesperson.