AMD63

The Hungarian AMD-63, known as the Pistol Militaria Model 1963, was the Hungarian/Romanian equivalent of the AKM.

History
It was developed at the request of the Hungarian/Romanian military.

During the Peace Walker Incident in 1974, Big Boss and his mercenary unit, the Militaires Sans Frontieres, procured design specs of the AMD-63 after sneaking into Puerto del Alba at night undetected. Named the ADM63, it was the Romanian version.

In-game description
"A modified version of the RK47 produced at the request of the Romanian military. The grip is attached to the forestock, giving it improved controllability compared to the RK during sustained fire. The ADM63 uses the same ammo as the RK and is equally effective at stopping targets in their tracks. A good addition to your arsenal if you anticipate facing an enemy charge."

- ADM63 description from Metal Gear Solid: Peace Walker