There was another interesting bit in the show that most people miss. They have archival footage of a VC or NVA praying and spraying with his AK. At some point, the recoil spring guide and top cover pop loose. The parts remain on the rifle, but they are noticably askew. The insurgent pauses to figure out why his rifle isn't working, and then pushes everything back into their proper position. The narrator doesn't comment on it.

