As an aside, as well as a blank firing gun, they'll usually have a rubber or airsoft gun for non-action scenes, which may or may not resemble the gun in the action scenes very closely. Rubber guns tend to bend and flop around under their own weight, for example, and airsoft guns can be pretty cheap and fake looking. Or sometimes they look exactly like one model of a gun, but the firing version is another, visually distinct version of the same weapon.
IIRC, they only made those in the Philippines when they were desperately short of everything, though the designer tried selling an improved version to civilians later.