For now a good way to change melee weapons is using keybinds with the injector.
example
F12
<pre class="ipsCode">bindKey ("I","game.game:GetActivePlayer():SetAnimStyle("melee","KnifeStyle")game.game:GetActivePlayer():ModelToHands(true,-1,22)")
bindKey ("J","game.game:GetActivePlayer():SetAnimStyle("melee","PolBatStyle")game.game:GetActivePlayer():ModelToHands(true,-1,28)")</pre>
example
F12
<pre class="ipsCode">bindKey ("I","game.game:GetActivePlayer():SetAnimStyle("melee","KnifeStyle")game.game:GetActivePlayer():ModelToHands(true,-1,22)")
bindKey ("J","game.game:GetActivePlayer():SetAnimStyle("melee","PolBatStyle")game.game:GetActivePlayer():ModelToHands(true,-1,28)")</pre>


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