The Semi-auto Shotgun can be purchased at the Gunsmith in Escalera for the base price of $1000. Additionally, with a high enough Honor, the price is reduced to $500, and with the Savvy Merchant Outfit this can be reduced to $250.
If the player failed to pick it up in the Catacombs, it can later be found on a pile of burning bodies whilst free-roaming. Picking it up will spawn a group of undead to attack, however.
It can some times be found before the final mission when zombies attack a person and kill them and the dead persons gun will be on the ground near his body, a good place to find a person in distress like this is on the north side of the frontera bridge.
The Semi-auto Shotgun is great for playing on Expert Mode because of its wide spread and above-average magazine capacity.
Up close, the Semi-Auto shotgun is capable of killing most players and animals in a single shot to the head or torso. However, like all shotguns, the Semi-auto drastically loses power when firing at distant targets.
The Semi-auto shotgun is one of the best choices for going lone wolf in Gang Hideouts.
The Semi-auto shotgun is also arguably the best mid-range weapon, because when shooting a person at mid range they will stagger, giving the player the opportunity to come up close for the kill.
This gun is especially good in Advanced Cooperative Missions, as you do not have to aim so much, and you can fire multiple rounds in rapid fire.
Like almost every other weapon in the game, combining Dead Eye with this shotgun drastically increases its range. It should be noted that the shot still has a wide spread, meaning aiming for the head in Dead Eye of a target very far away will not guarantee an instant kill.
The semi-auto shotgun is a superior weapon when going hunting for big game. It is extremely damaging and will assure you a kill with one or two well placed shots.
The Semi-Auto shotgun has far better range than other shotguns in the game, although it has a greater spread than the Pump-action Shotgun. Despite this, the Double-Barreled Shotgun is the last shotgun to be unlocked in Multiplayer.