My friend bought a brand new Benelli Supernova and found a choke with defect. One of the chokes had very strange looking edge.

Look at the pictures, it looks like the choke was sanded from one side:

Benelli Supernova Choke Problem (Defect)

Benelli Supernova Choke Problem (Defect)

Benelli Supernova Choke Problem (Defect)

Benelli Supernova Choke Problem (Defect)

Dealer replaced that choke with a new one. So be careful when buying a shotgun and check everything (including chokes) in a gun shop.

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Best Benelli Supernova Shotgun Articles: Upgrades, Accessories, Tips and Advices
Shotgun Chokes Explained