The Galil is an Israeli gas-operated air-cooled automatic rifle and light machine-gun introduced in 1973. It is a modified version of the Kalashnikov rotating bolt system. It was originally developed in 5.56 mm calibre, but later a 7.62 mm model was also produced. It has a rate of fire of 550 rounds-per-minute from either a 35 or 50 round curved box magazine, and has a muzzle velocity of 950 meters-per-second. The standard Galil has a fixed stock of wood or plastic or a folding metal stock, a bipod which doubles as a wire cutter, and an effective range of 500 metres. A short version, the Galil SAR was also produced with a folding stock and an effective range of 400 metres. The Vektor R4 is a modification of the Galil. Research Galil
The Vektor R4 is the South African standard rifle and is a slightly modified IsraeliGalil; the modifications consisted of changing the butt and fore-end to synthetic materials rather than steel, in consideration of the bush temperatures common in Africa, and lengthening the butt since the average South African is rather larger than the average Israeli. The Vektor R4 is chambered for the 5.56 mm M193 cartridge and has a rate of fire of 700 rounds-per-minute from a curved 35 round box magazine. Research Vektor R4
R4 was an American-built Peruvian submarine of 576 tons displacement launched in 1928. The R4 was powered by two Nelseco diesel engines providing a top speed of 14.5 knots and a range of 12800 km surfaced and electric motors providing a top speed of 9.5 knots submerged. She carried a complement of 30 and was armed with one 3 inch gun and four 21 inch torpedo tubes in the bow. Research R4
 
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