Best Double Rifle .375 H&H36601 - Gordy & Sons Outfitters
Why didn't armies use double-barreled muskets before the advent of repeating breach-loading firearms in order to double their available fire power? - Quora
Sidelock Double Rifle | James Purdey & Sons Ltd – Purdey Guns & Rifles
Double-barreled shotgun - Wikipedia
Double Barrel Rifle (and Shotgun) at Fallout 4 Nexus - Mods and community