These shotguns are considered special as they either do not show up in the Shooting Range, or they cannot be looted by normal means.
Special Blunderbuss with wings on each side. Supposedly has the same stats as the Regular Blunderbuss, but has a huge knockback and can knock the enemy back incredibly far.
Special Mossberg-500 with glowing yellow accents. Supposedly has the same stats as the Mossberg-500 but with a rare reskin.