yowzer
Enlightened
A Sound of Thunder (2005)
Surefire M4 models are used prominently in this film. They are each equipped with beam covers that fold flat when in the open position.
This film is a movie-length version of an episode in an old horror series who's name escapes me.
That episode was a filmed version of a famous short story by Ray Bradbury. The tv series was the not-very-old 'The Ray Bradbury Theater', from the mid/late 80's.