This video features a Merwin & Bray .42 Caliber Cupfire Revolver, a historical firearm designed to circumvent the Rollin White patent. The description highlights its cupfire system, which is technically similar to rimfire but uses a hollow cup at the base of the cartridge for priming. This design allows for front-loading of the cylinder and firing via a hammer striking through a rear aperture. The video focuses on this specific .42 caliber example, noting that while the case diameter is .42, the projectile is actually .39 caliber. The description also mentions other calibers this model was produced in (.28 and .30).
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