To obtain the secret weapons in Red Dead Redemption 2, players must complete specific tasks or visit specific locations.

The Algernon's Revolver can be obtained by completing the "Duchesses And Other Animals" Stranger mission, which is given by Algernon Wasp at his shop in Saint Denis.

The Calloway's Revolver can be collected from Slim Grant, one of the duelist targets, after completing the "The Noblest Of Men, And A Woman" Stranger mission, which is given by the writer in the saloon in Valentine. To find Slim Grant's location, players should speak to the Sheriff in Annesburg in Chapter 4-6.

The Flaco's Revolver can be obtained by defeating Flaco Hernandez, one of the duelist targets, in the "The Noblest Of Men, And A Woman" Stranger mission, which is given by the writer in the saloon in Valentine. Flaco Hernandez can be found at his camp, located near Cairn Lake outside Colter.

Emmet Granger's Revolver can be collected by defeating him, who is another target in "The Noblest Of Men, And A Woman" Stranger mission. He is located at the homestead east of Flatneck Station

Micah's Revolver can be obtained by looting his frozen corpse, after returning to Micah's camp on Mount Hagen after completing Epilogue 2. The location of the final showdown in "American Venom".

The Midnight Pistol can be collected from Billy Midnight, another target in "The Noblest Of Men, And A Woman" Stranger mission. He is accessible from the train station in Rhodes.

Otis Miller's Gold Revolver can be found in a hidden treasure chest located in a small cave north of Cholla Springs in New Austin, which is accessible after obtaining two treasure hunt maps. One of which is located at the Hermit Woman's shack in West Elizabeth, while the other is located at Manito Glade cabin, just north of Annesburg. Note that the Golden Revolver is only available after starting the Epilogue.

The Rare Rolling Block Rifle can be collected from the sniper shooting from the barn at the end of the "Magicians For Sport" mission.

Finally, the Rare Shotgun can be obtained by speaking to the Hermit, found in a cave west of Hanging Dog Ranch. Players can speak to him up to five times, but must wait three in-game days between each visit. Killing the Hermit will also drop the shotgun

To obtain the secret melee weapons in Red Dead Redemption 2, players must visit specific locations.

The Ancient Tomahawk can be found stuck in a target on the east side of Calumet Ravine, east of the Wapiti Indian Reservation.

The Antler Knife can be found stuck in a dead bear, northwest of Hanging Dog Ranch.

The Broken Pirate Sword can be found on an island south of Saint Denis. Players can access the island by traveling south from the southernmost bridge in the city via boat.

The Civil War Knife can be found in the basement of Fort Brennand, an abandoned fort outside of Van Horn.

The Double Bit Hatchet can be found on a tree stump northwest of Wallace Station.

The Hewing Hatchet can be found on a tree stump, located by the southern shore of Moonstone Pond.

The Hunter Hatchet can be found stuck in a tree stump south of Widow's Rock.

The Jawbone Knife can be obtained by successfully completing the "A Test Of Faith" Stranger mission. This mission is given by a stranger located southwest of Horseshoe Overlook in New Hanover.

The Rusted Double Bit Hatchet can be found on a tree stump in Annesburg, located north of the coal burner.

The Rusted Hunter Hatchet can be found stuck in a tree stump, next to a shack halfway between O'Creagh's Run and Elysian Pool.

The Viking Hatchet can be found in the Old Tomb area, next to the skeleton in the center, northeast of Beaver Hollow.

Finally, the Wide-Blade Knife can be found in the Beryl's Dream mine, located west of Mount Shann. Players will need to interact with the explosives plunger to clear the entrance before finding the knife, which is located deep inside the mine in a dead body.