A "rolling block" is a type of firearm action commonly used in single-shot rifles. It features a block that rotates to lock the breech when the rifle is fired. This design allows for a strong and secure closure, making it suitable for high-pressure cartridges. The rolling block mechanism was popularized in the late 19th century, particularly by the Remington company. Its simplicity and reliability made it a favored choice for military and civilian use, and many historical rifles were built using this action, contributing to its lasting legacy in firearm design.