 FAKE: During several scenes in the movie, permanent blank adapters  can be seen in the muzzles of the various weapons carried by Dutch  and his team. Most notably, the scene where Mac is walking through  the bush with his M60 barrel pointed towards the camera, and another  scene where Billy is shown emerging from the bush with the muzzle of  his M16 pointed towards the camera. There should only be one hole at  the end of the barrels of each weapon, but what can be seen is a  small reversed cone shape inside the flash suppressor indicating  permanently modified blank firing weapons.