Guide rails that support the bolt assembly and piston extension during their reciprocating movement are riveted to the side plates. The front is reinforced to accept the barrel nut and gas cylinder which are permanently mounted. The MAG's receiver is constructed from sheet metal stampings reinforced by steel plates and rivets. The machine gun has a striker firing mechanism (the bolt carrier acts as the striker as it contains a channel that houses the firing pin, which protrudes out from the surface of the bolt upon firing), an automatic-only trigger assembly and a manual cross-bolt push-button safety, which is located above the pistol grip. After firing, spent cartridge casings are removed downwards through an ejection port normally covered by a spring-loaded dust cover at the bottom of the receiver.

Both the spring-powered extractor and ejector are contained in the bolt.

The unlocking sequence starts after 15 mm (0.6 in) rearward gas piston rod movement to keep the breech block fully locked until the bullet has left the gun barrel and the high-pressure propellant gas pressure has dropped to a safe level. The locking shoulder and camming surfaces that guide the locking lever are located at the base of the receiver. The barrel breech is locked with a vertically tilting, downward locking lever mechanism that is connected to the bolt carrier through an articulated joint. The MAG operates via a long-stroke piston system, which utilizes the ignited powder gases generated by firing vented through a port in the barrel to propel a gas piston rod connected to the locking assembly. The MAG is available in three primary versions: the standard, infantry Model 60-20 machine gun, the Model 60-40 coaxial machine gun for armoured fighting vehicles and the Model 60-30 aircraft variant.Ī schematic showing the mechanism of the FN MAG. The weapon's name is an abbreviation for Mitrailleuse d'Appui Général, meaning 'general support machine gun'. It has been used by more than 80 countries and it has been made under licence in several countries, including Argentina, Canada (as the C6 GPMG), Egypt, India and the United Kingdom. The FN MAG is a Belgian 7.62 mm general-purpose machine gun, designed in the early 1950s at Fabrique Nationale (FN) by Ernest Vervier. Non-disintegrating DM1 or disintegrating M13 linked beltįolding leaf sight with aperture and notch, front blade Gas-operated long-stroke piston, open bolt

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