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What if the high-low pressure principle that was the basis for making the M79 grenade launcher system (as well as all modern under slung rifle grenade launcher systems) was discovered pre-WW1 and resulted in all powers having access to weapon systems similar to those we use today based on that?
https://en.wikipedia.org/wiki/High–low_system
https://en.wikipedia.org/wiki/M79_grenade_launcher
https://en.wikipedia.org/wiki/40_mm_grenade

This was a late WW2 design based on it:
https://en.wikipedia.org/wiki/8_cm_PAW_600

Would then the WW1 combatants have dedicated grenade launchers like the M79 or still use rifle grenades? Would that make any appreciable difference to how squad tactics worked or their ability to fight?
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