SIG introduced the 540 series of rifles in 1973, which included the full-length 540 in 5.56mm, the 541 in a number of experimental calibers for the Swiss military, the 542 in 7.62mm NATO, and the 543 carbine with an 11.8″ (300mm) barrel in 5.56mm. In 1978 they licensed production of the 540, 542, and 543 to Manurhin in France, to sidestep Swiss export laws. The rifles were sold to a wide variety of small nations in Africa, South America, Asia, and the Middle East – including Lebanon, where this example came from. A batch of 542 and 543 kits came into the US from Lebanon recently, and Troy Ess at TTE Precision Metalwerks developed semiauto receivers for them.
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