The SIG SG-540 had been developed by Swiss SIG (┬źSchweizerische IndustrieGesellschaft┬╗) in the mid-1970s and was suqbsequently licensed to Manurhin, France, and FAMAE, Chile, for export to avoid the strict Swiss export laws. It was adopted by the French (who replaced it with the FA MAS in the early 1980s), Portuguese and Chilean armies as their standard issue rifles, as well as several smaller African and South-American countries. Early prototypes of the SG-540 (called SG-530) were built with a type of roller-locked acrion but to make the rifle chaper and more reliable this was later changed to the gas-operated action with a gas piston attached to the bolt carrier. The trigger unit has a safety switch/fire selector on the left side of the receiver with settings for safety, semi-automatic and fully-automatic fire. An additional limiter to allow three-round bursts can be installed in the trigger mechanism. The rear iron sights are drum-type. The SG-540 has a muzzle break of NATO-standard diameter to allow the launching of rifle grenades from the muzzle. It has an integral folding bipod under the handguard, and can be issued with either a fixed plastic buttstock or a side-folding tubular metallic buttstock (HO -4, SS 11, Acc 7, Rcl -2 when folded). The SG-543 is a carbine version of the SG-540 that cannot mount the bipod or launch rifle grenades, but is usually fitted with a folding stock (HO -3, SS 10, Acc 5, Rcl -3 when folded). Both the SG-540 and the SG-543 use the same 20- or 30-round magazines. The SG-542 is a larger battle rifle chambered for the 7.62x51 mm cartridge. Otherwise similar to the SG-540, the SG-542 can also be fitted with a folding stock (HO -4, SS 13, Acc 8, Rcl -3 when folded).




Was this article helpful?

0 0

Post a comment