OT - Complicated Ammunition Magazines

[kato13]

I have a side project that I have been working on using "Guns, Guns, Guns" to produce next generation weapons.

Of course when anyone looks at such weapons the M41A Pulse rifle usually is something one might use as a touch stone.

I have been trying to do the math on how 99 10mmx24 (caseless) would fit in a mag and the pictures below seem to offer a possibility.




In order to make the "turn" in the "U" at the bottom, I am wondering if something more than a spring would be in use. Given the rounds are square I think a spring would not cut it.

I know the P90 mag (below) moves the ammo 90 degrees before firing.


And I was wondering if there were other real world examples if mechanical or electrical movement of rounds through a mag that I could use for inspiration.