The British Army, and RAF Regiment, use the FN MAG as their GPM. There is a wide variety of variants, but the most common is the L7A2.
If you're referring to the British L7 GPMG, it fires the NATO standard 7.62x51 cartridge. As for the class of machine guns in general, it tends to be in the same vicinity - the first true General Purpose Machine Gun utilised the 7.92x57 cartridge, while the rimmed 7.62x54R is standard for Soviet/Russian client states.
The purpose of the general format and layout is that it gives you a standard procedure.
general purpose, as it can be programmed to perform any special purpose task.
The general purpose of the Continental Congress was to unite the colonies in their opposition to British policies.
A machine that can perform many different functions for everyday use
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Tommy Flowers and Max Newman invented the Colossus computer. Its purpose was to help crack the German High Command's teletype codes that the British called "Fish".
to show the british that the colonists would not pay for the taxed teas
The M60 general purpose machine gun has an overall length of 43.5 inches (1,105 millimeters).
The idea of a general-purpose computing machine is primarily attributed to Alan Turing. In 1936, Turing introduced the concept of the Turing Machine, a theoretical framework that can simulate any algorithmic process. This foundational work laid the groundwork for modern computer science and the development of computers capable of performing a wide range of tasks.
The M60 general purpose machine gun is chambered for the 7.62x51mm NATO cartridge.
M-60 is a belt fed, air cooled, general purpose machine gun.