Pretty neat. I can see how they look something like the G11 ammo, but I had always assumed that the "caseless" ammo in ALIENS meant that the rifle was EMP... after all, it is called a "pulse rifle." I further assumed that EMP ammo would account for the small magazine size.
Then again, Metal Storm is caseless, too, yet uses a chemical explosive.
"the "pulse" refers to the energy pulse used to ignite the propellant"
Ah, so it is like Metal Storm.
As for not caring if it was possible... I guess that's a common pitfall of the movies: Guns that never need to be reloaded, spaceships that are not the TARDIS having interiors too big to fit inside the exterior (Jupiter 2, Space: 1999 Eagle, etc.), and people who are not in the MATRIX stopping a terminal velocity freefall by grabbing a passing handhold all without ripping an arm off.
The weapon in John Scalzi's OLD MAN'S WAR with the "universal" block of ammunition was pretty wild.
True, but it's a science fiction movie! Interstellar spaceships and suspended animation didn't exist when he made the movie, either. I'm perfectly okay with the movie using chemical propellants in the bullets. In fact, ALIENS delivered far more of the military tech than STARSHIP TROOPERS. (By that I mean Heinlein's book seems to have been at least an inspiration to Cameron.) ALIENS even gave a nod to the powered armor of the book, while the Morita in TROOPERS was spitting out casings everywhere. And you know how dangerous those loose casings can be www.youtube.com/watch?v=zhe58x…