There's definitely a pattern here.
The Navy SEALs have continued to use and upgrade the M60E3, (which came out in the 1980’s), because of its portability and low weight for its caliber. The MK43 Mod 0 is an improved model that was developed for the U.S. Navy SEALs in the 1990’s to replace their existing stock of M60E3 machine guns fitted with shorter “assault barrels”. It has extra rails for mounting accessories, and a quick-change barrel. The M60 machine gun is gradually being phased out in favor of the heavier M240 machine gun, which is more reliable.
|M-43 Mod 1|
The US Ordnance MK-43 Mod 1 machine gun is fitted with the short (17.5 inch), fluted barrel. It is topped with a Trijicon Advanced Combat Optical Gunsight on the distinctively angular machined feed cover’s rock-steady integral rail and a PEQ-2A laser aiming module on the Mod 1’s new Rail Interface System forearm. The Tango Down vertical grip allows the weapon to be operated without a bi-pod by the shooter. This is likely the last evolutionary move for the M-60 before the SEALs start cutting down the M-240 into something more functional for a single operator (instead of as a crew-served weapon system). The limiting factor for this sort of weapon is the amount of ammunition that can be carried to support its use in the field. Though load-outs of SEAL platoon vary based on Team and platoon preference depending on the mission to be undertaken, the MK-43 is still a regular fixture.