Contents • • • • • • • • • • • • • Design details [ ] Operating mechanism [ ] The R4 is a, weapon that fires from a. As with the parent weapon, the operating system is derived from that of the. It uses ignited gases channelled through a vent in the to drive a long stroke piston located above the barrel in a gas cylinder to provide power to the operating system. The weapon features a self-regulating gas system and a rotary breech locking mechanism (equipped with two locking lugs), which is rotated by a helical camming groove machined into the bolt carrier that engages a control pin on the bolt. Extraction is carried out by means of a spring-loaded extractor contained in the bolt and a protrusion on the left guide rail inside the acts as the fixed ejector. Features [ ]. A South African soldier armed with an R4 during a training exercise in 2013 The R4 is hammer-fired and uses a trigger mechanism with a 3-position fire selector and safety switch.

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The stamped selector bar is present on both sides of the receiver and its positions are marked with letters: 'S'— indicating the weapon is safe, 'R'—single-fire mode ('R' is an abbreviation for 'repetition'), and 'A'—fully automatic fire. The 'safe' setting disables the trigger and secures the weapon from being charged. The R4 is fed from a synthetic box magazine with a 35-round cartridge capacity (designed to use the cartridge with the M193 projectile) loaded in a staggered configuration. During the 1980s South African troops were issued with one 50-round magazine as well.

The is slotted and doubles as an adapter for launching. Bolted to a bracket in the gas block, under the barrel, is a lightweight folding (folds into the handguard), which includes a cutter in the hinge. The R4 has a side-folding tubular stock, which folds to the right side of the receiver. The rifle's handguard,, magazine, stock arms and shoulder pad are all made from a synthetic material, making it lighter in weight than the equivalent original model which uses heavier metal and wood in these components.

For regular field maintenance and cleaning, the firearm is disassembled into the following components: the receiver and barrel group, bolt carrier, bolt, return mechanism, gas tube, receiver dust cover and magazine. Sights [ ] The rifle has conventional that consist of a front post and a flip-up rear sight with 300 and 500 m apertures. The front sight is adjustable for windage and elevation and is installed in a durable circular shroud. The rear sight is welded at the end of the receiver's dust cover. For nighttime use, the R4 is equipped with self-luminous light dots (exposed after placing the rear sight in an intermediate position) installed in a pivoting bar to the front sight base, which folds up in front of the standard post and aligns with two dots in the rear sight notch.

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