Clearly JB means John Browning. And he knows what he's doing with guns.
I'm gonna disagree with ya there Danjal.
I think JB stands for Joe Biden.
This is Joe's home defense shotgun.
When somebody is breaking in to your house you just take it out and fire both barrels into the air to scare the bad guy off.
It never needs sighted in cause it's never gonna be aimed at anyone.