Movie prop replica

Hi, I'm new here and I'm interested in obtaining one or two blank firing replica firearms for the purpose of making a film. Can anyone reccomend a few really good ones? I'm looking for the kind that releases the gas out of the front of the barrel as opposed to through a hole on the top/side of the barrel, and I would really like to see one that has a threaded barrel so that I can use a mock-silencer with it.

Also, if there are any airsoft/bb guns that have an authentic look and action, good enough to stand up to a close-up shot, that would be acceptable.