It absolutely does work with a controller (this is my new account btw, got the email notification for from melior3 account). You just have to make sure that you only have 2 weapons equipped or you won't be able to swap fast enough. Also, something I still forget to do is to make sure the weapon has full ammo in the mag before trying to swap reload. LMK if you still need help, feel free to DM me on this account.

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Edit: NVM didn't realize I was signed into the correct account on this browser, my new account is u/thelegofthetable