Red Dead Revolver
The following firearms were featured in the video game Red Dead Revolver.
The Old Pistol is a percussion-era revolver that looks like a cross between a Colt Dragoon, a Colt 1860 Army, and even a little bit of a Remington 1858 New Army (loading lever shape). It doesn't even enter the neighborhood of the 1875 model, except by way of the earlier 1858 model, even if the manual states this (which is doubtful).
Colt Single-Action Army
Multiple weapons in the game appear to be SAAs.
The Six-Shooter is a Bisley-model Colt Single Action Army with a cavalry-length barrel.
The Revolver/Twin Revolvers are Colt Single Action Army revolvers with long barrels. Jack Swift's primary weapons are the Twin Revolvers.
The Pacificador is closest to a Colt 1851 Navy. "Pacificador" means "Peacemaker" in Spanish. The same weapon appears also on the cover of the game.
Colt 1860 Army
Two revolvers in the game resemble the 1860. The Inquisitor most closely resembles an intricately detailed Colt 1860 Army, and the Scorpion Revolver is closest to the same model.
Merwin and Hulbert Revolver
The Widowmaker resembles a highly embellished Merwin and Hulbert Revolver.
The High Caliber Rifle looks like a Henry 1860 rifle. It is also the primary weapon for Annie Stoakes and Buffalo Soldier.
Spencer 1860 Carbine
The Owl Rifle looks like a Spencer 1860 Carbine with a brass receiver.
Winchester Model 1873
Several different rifles in-game resemble the Winchester Model 1873:
The "Halcon Rifle" is a basic 1873 in carbine configuration.
The "Repeater Rifle" is an 1873 with an unusual dropped stock with a cheekpiece, and a shortened magazine tube.
The "Bayonet Rifle" is another 1873, albeit in a configuration resembling a Winchester Model 1876 musket-carbine.
Side-by-Side Double-Barreled Shotgun
There are multiple double-barreled shotguns in-game, with different names and configurations.
A double-barreled shotgun with exposed hammers and incredibly long barrels.
A double-barreled shotgun with exposed hammers that looks like a fancy English hunting gun.
"12 Gauge Shotgun"
A double-barreled shotgun with exposed hammers.
A double-barreled shotgun with exposed hammers, cut-down barrels, and the stock cut down into a pistol grip.
A double-barreled shotgun with exposed hammers. "Escopeta" means "shotgun" in Spanish.
A hammerless double-barreled shotgun. "Zwei Fässer" means "two barrels" in German, like in two barrels of beer, but NOT two gun-barrels, which would be "zwei Läufe". Whoever named the weapon probably used the first translation they could find, without researching further.
Would somebody be so kind as to figure out something about the cannon/cannons in this game? I honestly have no clue, and I'd rather not make an ass of you and me.
The Gatling Gun is usable in the game, notably being mounted on a stand in a partially demolished building.