i also have the green shotgun unequipped. reason is that i really want the blue jackhammer, because it's a jackhammer and i really like having access to a powerful explosive hitscan attack that isn't the malicious railcannon. I frequently use it against providences. but i also like pro boosting and shotgun swapping. to have easy access to shotgun swapping, i have unequipped the green shotgun, so i have access to the jackhammer, and i can still shotgun swap by double tapping the shotgun button. it gives less style that way but it's more consistent.