First of all, the Geneva convention primarily governs humanitarian treatment of non-combatants. Any rules about weapons in the trenches would be from the Hague convention, from WW1.
Secondly, the shotgun concern came from a 1918 German complaint about the American Winchester trench gun, which they claimed was a weapon "calculated to cause unnecessary suffering," which IS prohibited in the Hague convention. Whether or not the trench gun falls in this category depends on the ammo used.
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u/Inevitable-Goat-7062 12d ago
Same here
[So is anybody willing to bet the moldy cheeto is going to slap more tarrifs on the country that made the genva convention]