The 12-gauge rounds filled with metallic BB pellets are highly effective at point blank range, although the BB's lose their velocity after traveling a short distance and become harmless after a while. Despite its limited ammo, it is very powerful, able to obliterate hordes of infantry with a single shot and even destroy vehicles easily with just a few. The upgraded version has more range, at the cost of even less ammo.
A Shotgun contains 30 ammo from Metal Slug to Metal Slug 5, while the Big Shotgun contains 15 ammo.
Metal Slug 6
Metal Slug 7/XX
Metal Slug and Metal Slug 2
Metal Slug X to Metal Slug Advance
Metal Slug 3D to Metal Slug 7
Metal Slug XX
The Shotgun in the Metal Slug series have more in common with Meltaguns from Warhammer 40k than any other shotgun.
Infantry units inflicted upon by the Shotgun's blast are knocked back at a great distance.
In Metal Slug 5, when the Shotgun is used while sliding, the player's control of the character is delayed for a longer time compared to other special weapons.