Unlock explosive rifle in Red Dead Redemption: Undead Nightmare by clearing Rathskeller Fork

In "Red Dead Redemption: Undead Nightmare," players can unlock the powerful Explosive Rifle by liberating the Rathskeller Fork settlement from zombies. This area is located in the top-left section of the map, near Gaptooth Ridge. After clearing the zombie infestation, players will unlock Rank 1 of the Explosive Rifle challenges and gain access to the weapon. The rifle holds 30 rounds and can be restocked by looting. Players can complete five challenge ranks to unlock the Master Exploder Trophy. Challenges include killing various types of zombies and obtaining the US Army Uniform outfit during the "American Imperialism" mission.