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. 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.

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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.

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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. Zakoni elektrodinamiki i princip otnositeljnosti prezentaciya video. 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.

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