I’m wondering if the new Beyblade Burst turbo drivers have been used. Are they even allowed due to their slingshock?

I'm pretty sure SlingShock Drivers are tournament-legal. The answer to your first question is probably no. Turbo is making appearances here and there in the US, but I don't think it's fully released everywhere yet. Your best bet would be to keep tabs on the Winning Combos thread in case any SlingShock Drivers actually wind up performing well as well as future tournament reports for upcoming tournaments to see if the Organizer saw any Turbo parts being used at their tournaments. I actually might've tried using a couple SlingShock Drivers at a tournament I recently hosted on the 25th, but I didn't participate.

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Thanks and have a good one!