A lot of today's movie/TV gun action is strictly fake. "Guns" are deactivated or complete dummies "firing" propane gas. The sound is dubbed in later. Ever since a few stupid actors blew themselves right off the set and out of the world with blanks, Hollywood doesn't even like to use them, hence the propane guns and other gimmicks to simulate firing. Obviously, the fake guns are not the only dummies around Hollywood sets.
Jim
Jim