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The delayed blowback action of the HK weapons delays the cycling action enough to where it allows the pressure to lower inside the bore so that the cycling is not fast enough to over pressure the barrel... this also helps with fouling. Not sure if that was what you were trying to do (since i honestly didnt read the whole thing)... but there it is.

You will also notice on G3 rifles that the left side of the forearm holds the oprod and when the oprod is fully back it exposes the gas system... wich also helps reduce ALOT of the pressure and fouling in the gas system. Same goes for some of the AK variants with the holes in the gas tube... when the AK piston moves all the way rearward... it exposes the holes in the tube and the extra pressure exits the gas system through the holes.

BC
 

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Not all of them do... but some do. Most rifles with piston driven op rod systems compensate for fouling by having really easy disassembly. For instance... the M-14. Unscrew the nut using your hands (finger tight) or the Multi tool... and stick the chamber cleaning down in there and pull it out. It is now clean (for field purposes).

BC
 
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