Aliens: Missing Scene?

I'm a big fan of the Alien movies, and Aliens is one of my favorites, though I don't own any of them on anything but VHS. Every time I catch Aliens on TV though, even on Movie Channels who don't have commercial breaks or reasons to show 'abridged' versions of the film, there's a particular scene missing:

the one where they all nervously wait as the Aliens match themselves against the Auto-Guns, using up near every bullet before retreating. Every time I see Aliens, both the set-up for that scene and the scene itself are gone! I'm curious, is this omission just about it being a 'TV version' of the movie meant to save time, or is the Auto-Gun scene from some directors cut I didn't know I was watching as a kid? Makes no sense to me that movie networks without advertisements would show a shortened version.