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see... the upper receiver would just be cut from a single piece of tube steel... the cylindrical receiver just extends in front of the barrel trunnion to form a handguard/shroud, like a sten crossed with a PPSH, the cost of manufacturing on a large scale would be fairly inexpensive...
but the problems raised with the piston ring over the barrel ive already noticed... delayed-roller blowback such as that on the G3 rifles, or CZ-52 pistol would be best, and maintain the simplicity of the design which, even though blowback does foul faster, would still be an incredibly reliable, simple design
another idea i had was to have a moving chamber that fits inside the trunnion... upon firing, the breach plug flies backwards from the energy, but never completely out of the trunnion, so no gasses get into the receiver, it hits a stop before that happens, and the momentum from this all, combined with a cam unlocks the bolt, and allows it to eject and chamber a new round... since ive never seen any firearm operate this way, its really hard to predict how it would work
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