<item_modifier name="modMeleeWeightedHead" installable_tags="light,medium,heavy,turretMelee" modifier_tags="damage" blocked_tags="noMods,perkDeepCuts" type="attachment">
<property name="Extends" value="modGeneralMaster" param1="CustomIcon" />
<property name="UnlockedBy" value="modMeleeWeightedHeadSchematic" />
<property name="TraderStageTemplate" value="modsTier1" />
<!-- Increases stun chance; increases stamina use, axe, hammer, club -->
<effect_group tiered="false">
<requirement name="RandomRoll" seed_type="Random" min_max="0,100" operation="LTE" value="15" />
<triggered_effect trigger="onSelfAttackedOther" action="AddBuff" target="other" buff="buffInjuryStunned01" />
</effect_group>
The head adds a 15% chance to stun. That is not insignificant. I'd take that over the stamina any day of the week.