This was brought up on Reddit, and I just tried to find what Grip mods this weapon can take, but did not find any. I did a search here in the Forum to see if this was reported, but nothing showed up. I have Grip mods for the Impact Hammer, Pitch/Tossball Blocker, Pitch/Tossball Stick, Plasma Cutter, Pulse Hammer, Sentry Blade, Stun Baton, Telescoping Staff, and Trip Blade, and none of them fit on the Jackpot. I don't know if there are weapons I have not come across yet, but it is also possible that the Jackpot was not properly assigned a weapon type, so it cannot actually use any Grip mods at all, because there are no Jackpot Grip Mods.
