R, noun2
/ɑː(r)/
The eighteenth letter of the alphabet, combined with various numbers to denote military rifles of local manufacture.
a. R1: The name given to the Belgian automatic F.N. (7,62mm) assault rifle when manufactured locally. Also attributive.
1971 F.V. Lategan in Std Encycl. of Sn Afr. IV. 532The..series of ‘short Lee Enfields’..was partly replaced by the Belgian automatic F.N. (7.62 mm Cal.) in 1961, which shortly afterwards was manufactured as the R.1, the military rifle of the Republic of South Africa.
1992 C.M. Knox tr. of E. Van Heerden’s Mad Dog 151The Leader climbs out (the slap of palms against R-1s from the present-arms squad tells us that).
b. R4: A 5,56mm military assault rifle (see Paratus quot. 1979).
1979 Paratus May 1The development of a new rifle, dictated by the needs of modern warfare. It is a 5,56 mm rifle, known as the R4. Other specifications include: Weight — 4,3 kg, length — 970 mm (stock extended) 740 mm (stock folded); length of barrel — 460 mm. The rifle is gas-operated with a rotating bolt. Magazines: 35 rounds (standard). Cyclic rate of fire: 650 rounds a minute; maximum effective range: 600m.
c. R5: A 5.56mm assault rifle with folding stock, a short-barrelled version of the R4. Also attributive.
1993 Sunday Times 10 Oct. 7Right-wingers, three of them national servicemen, made off with at least 20 R5 rifles, 20 shotguns and 30 South African-made Z88 9mm pistols.

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