In early practice of autofrettage of a gun barrel, the barrel was pressurized hydraulically. Invar is weapon fired from the Gun barrel of T-90 Tank. It begins with a close-up of a gun barrel. They are small enough to be easily rail-mounted to a gun barrel. Wah, proceed to lower the gun barrel. This creates shorter weapons in comparison to rifles with the same size of gun barrel. Products of combustion within the gun barrel include flammable gasses like hydrogen and carbon monoxide. This imparted stability through spin, like rifling in a gun barrel. The couch gag is a reference to the James Bond gun barrel sequence. A silver bullet accepts the rifling of a gun barrel. WWE wrestler "Cesaro"'s entrance is also similar to that of James Bond gun barrel sequence. Hawkeye shot an arrow into Egghead's gun barrel. The penetrator is carried by a sabot during its acceleration in the gun barrel. There it was used as part of the actual gun barrel and main title sequence. This acid would erode the inside of the gun barrel and the lock mechanism.