The South African R4 assault rifle was used by some of the MNU forces. It chambers the 5.56x45mm NATO ammunition and has a rate of fire of 600 rounds per minute. Being a kalashnikov type assault rifle it is reliable and doesn't jam when exposed to dirt and mud. It has a 35 round clip and can drain it in 3.2 seconds.
The R4 is a 5.56mm assault rifle that was introduced into service with the South African Defence Force (SADF) in 1982, replacing the earlier 7.62mm FN FAL rifle, that was manufactured in South Africa under a license agreement from Fabrique Nationale as the R1. The R4 is produced by Vektor (a small arms division of Denel corporation, currently Denel Land Systems).
The weapon is a licensed variant of the Israeli Galil ARM assault rifle with several modifications; notably, both the stock and magazine are now made of a high-strength polymer and the stock's arms were lengthened, adapting the weapon for the average MNU Soldier.