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I have one of these poseidon barrels, wide bore at the muzzle and had this groove.
I 100% buy the theory of it "centering" the bb, however as long as your bore is close to perfectly round and the hop pressure come from top center, your bb will be centered too. This groove in reality just adds more liability as it has to be dead center and symmetrical.
compared it to a Prometheus gen2 barrel, didn't notice any difference.
 
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