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The Ratmil is a Romanian blowback-operated sub-machine-gun introduced in 1995. The Ratmil takes a 9 mm cartridge from a 30-round box magazine and fires with a cyclic rate of 650 rounds per minute and a muzzle velocity of 370 meters-per-second.
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The Reising Model 50 was an American sub-machine-gun patented in 1940 and accepted for service by the US Marine Corps who used it at Guadalcanal, where it jammed so frequently that it was thrown away. The Reising Model 50 was chambered for the .45 calibre cartridge which it took from a 12- or 20-round box magazine and fired with a cyclic rate of 550 rounds per minute and a muzzle velocity of 280 meters-per-second.
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The Rexim sub-machine-gun was a Swiss weapon introduced in 1953. The Rexim fired a 9mm cartridge from a 20-round box magazine at a cyclic rate of 600 rounds per minute and a muzzle velocity of 396 meters per second.
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The RP-46 is a Russian gas operated automatic company machine-gun adapted from the Degtyarev DPM, produced from 1946 to 1954, and intended for use as a company support gun. The RP-46 is chambered for the 7.62 mm x 54R Soviet cartridge which it takes from a 250-round cloth belt feed or can take the Degtyarev DPM drum magazine and fires at a cyclic rate of 600 rounds per minute and a muzzle velocity of 840 meters per second to an effective range of 800 meters. The RP-46 has a 607 mm long barrel and is fitted with a cylindrical post foresight and a leaf tangent with a V rearsight. The RP-46 was superseded in the Russian army by the RPD.
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The RPD is a Soviet gas operated automatic light machine gun first developed during 1943 as a machine-gun to utilise the then new 7.62 mm x 39 cartridge. The RPD took a 100-round disintegrating link belt feed carried in a drum and fired with a cyclic rate of 700 rounds per minute and a muzzle velocity of 700 meters per second to an effective range of 800 meters. The RPD had a 521 mm long barrel and was fitted with a cylindrical post foresight and a leaf tangent with a V rearsight.
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The RPK-74 is a Russian machine-gun produced since 1977 as a heavy-barrelled version of the AK-74 rifle, used as a light machine-gun. The RPK-74 originally took the 7.62 mm x 39 cartridge, and was later developed to take the 5.45 mm Soviet cartridge from a 30-, 40- or 45-round box magazine or 75-round drum magazine and has a cyclic rate of fire of 660 rounds per minute. The RPK-74 has a muzzle velocity of 732 meters per second and an effective range of 800 meters. It has a 591 mm long barrel, with no barrel change provision, and is fitted with a cylindrical post foresight and a leaf notch rearsight.
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The Ruger MP-9 is an American blowback operated sub-machine-gun developed from the Israeli Uzi during the 1980's. The Ruger MP-9 is made of steel alloy and glass fibre reinforced plastic and fires a 9 mm cartridge from a 32-round box magazine with a cyclic rate of 600 rounds per minute and a muzzle velocity of 350 meters per second.
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Abbreviations
Warfare
