I obtained this from the Gift Shop, an underground storage area you gain access to after completing the main story missions in Claptrap's New Robot Revolution DLC (DLC 4)
The 110 Thunder Storm is a fantastic Shotgun, really good spread, very high damage, good accuracy, incredible fire rate. Oh, and it has infinite ammo!!!
Essentially it's a recharging clip, after depleting the mag you have to wait around a minute for it to fully recharge. You can, however, fire off rounds before it's fully charged.
Always prevelant to keep one of these in your inventory in case you manage to run out of ammo with everything else.
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