Don't know if this is going to post,
Thompson .45 and 870 Rem in 12 gauge with collapsible shoulder stock...
Sounds like what they should be issuing to our troops in Baghdad that have to do entries!
The H&K case-less never took off because the propellant was never quite moisture or UV proof and didn't store very well.
The first versions of the P-90 were supposed to be case-less also, but that didn't work out either.