GW sculptors seem to adjust sizes to make them fit the models (After all, a human wielding a Terminator sized weapon would be ridiculous, they could hardly lift it). So it depends on the size of the models you are converting. If they're in Power Armour get some Storm Bolters from Power Armour kits (Sternguard, Sergeants etc.), if they're Terminators the choice is obvious, and if they're mortals then find some human sized ones.
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