The weapon is a licensed variant of the IMI Galil assault rifle[9][10] with several modifications; both the stock and magazine are now made of a high-strength polymer and the stock was lengthened, adapting the weapon for the average South African soldier.[9] Other detailed differences include the R4's lack of a carry handle and a number of modifications made to its internal operating mechanism.[8]
Design details
Operating mechanism
The R4 is a selective fire, gas-operated weapon that fires from a closed bolt. As with the IMI Galil, the operating system is derived from that of the AK-47. It uses ignited powder gases channelled through a vent in the barrel 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 bolt 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 receiver acts as the fixed ejector.
Internally, the R4 differs from the Galil in the addition of a new gas tube lock to prevent the tube from shaking loose during sustained fire, and the introduction of much wider sear.[7] It also has a unique bolt and firing pin, both of which were redesigned to resolve an issue where the firing pin would set off a chambered cartridge with the bolt closed.[7] The new firing pin is secured by a polyurethane piece inside the bolt except when positively driven forward.[7]
The R4's parts can be interchanged with the Galil ARM with Valmet rifle magazine made for 5.56 NATO caliber being usable for the R4.[11]
Features
A South African soldier, part of the UNpeacekeeping force, 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 sheet steel 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 steel or synthetic box magazine with a 35-round cartridge capacity (designed to use the 5.56×45mm NATO cartridge with the M193 projectile).[7] Steel magazines were initially manufactured for the weapon, but this was replaced by a nylon and fiberglass copy to reduce weight.[7] A 50-round steel magazine was produced during the 1980s.[7]
The R4 has a side-folding tubular stock, which folds to the right side of the receiver. The rifle's handguard, pistol grip, magazine, stock arms and shoulder pad are all made from a synthetic material, making it lighter in weight than the equivalent original Galil, 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 iron sights 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 tritium 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.
Upgrade
DLS has introduced remanufactured models of the R4, R5, R6 that have Picatinny rails. DLS has also introduced grenade launchers, grips and other underbarrel attachments.[12]
Variants
The LM5, a semi-automatic version of the R5 carbine
In the 1990s, an even more compact personal defence weapon variant of the R5 was developed for armoured vehicle crews, designated the R6, which has a further reduced barrel and a shortened gas cylinder and piston assembly. This reduced the barrel length to 279 millimetres (11.0 in).[8]
Denel developed prototypes for the R7 and R8, a heavy barrelled squad automatic weapon and a locally produced Micro-Galil, respectively, but it is unclear whether these entered production.[8]
LIW/DLS also introduced a line of semi-automatic variants of the R4, R5 and R6 called the LM4, LM5 and LM6 respectively, built for civilian and law enforcement users. The rifles were marketed by Musgrave, with the joint venture between the Lyttelton and Musgrave conferring the rifle's "LM" prefix.
Vektor Rifle
Specifications
Model
Overall Length
Barrel Length
Weight
ROF
R4 Rifle
1,005 mm (39.6 in) stock extended 740 mm (29.1 in) stock folded
460 mm (18.1 in)
4.3 kg (9.48 lb)
650–700 rpm
R5 Carbine
877 mm (34.5 in) stock extended 615 mm (24.2 in) stock folded
Savior: 1998 war film starring Dennis Quaid set during the Bosnian War. Quaid's character uses an R4 modified as a designated marksman rifle. According to Imdb, this weapon would have been used by the Bosnian Serb military which purchased several thousand R4 rifles during the conflict, but not by the French Foreign Legion. The modifications include a scope mounted on an AK-style receiver mount (the original Galil scope mount notch was replaced by a lightning cut on the R4), along with a cheek rest which has been installed on the original folding stock and removal of the sights.
