I think the 28 suffers for some of the same reasons the 16 does (I love my 16's! They're old.). It's built on the next gauge up frame these days.
I'm pretty sure the BPS is a 20 ga frame, as is the Model 12. This makes the gun heavier, which plain sucks.
Like Steave said, I'd rather shoot the 20...

Now that Franchi 48AL would be a treat! But talk about making expensive empty hulls in a hurry!!

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War Eagle! '10 BCS & '13 SEC