I remember watching a movie about 10-15 years ago about some exploration group in the jungle being attacked by very angry gorillas or apes while defending their camp with automated gun turrets at night.
I know it seems like a long shot but its all I can remember, since I was 11 or 12 years old. :D
It sounds very much like Congo, the 1995 adaptation of Michael Crichton's novel of the same name.
The story involves an expedition to a lost city which is defended by a breed of gorillas who were trained as guardians of the city. The gorillas kill by smashing victims' heads between two large rocks.
The expedition used a lot of high technology gadgets, including automated motion-sensing defensive turrets (which were triggered while they were sleeping, and kept the gorillas at bay).
This may be the movie Congo. Although I've not seen it, Wikipedia's plot summary includes the following, which seems to match your description.
Gray gorillas then attack the perimeter after dark and are driven off by automated machine guns set up by Karen.
