The SIG 510 is an assault rifle (technically a battle rifle) manufactured by SIGARMS (now SAN Swiss Arms) of Switzerland. It is based on the same roller-locked delayed-blowback system used in the H&K G3 and CETME rifles. It is considered to be one of the most accurate mass-produced assault rifles available, and is very reliable in harsh climatic conditions.
It is in service in the Swiss Army with the designation F ass 57 (French, for Fusil d' Assaut 57) or Stgw 57 (German for Sturm Gewehr 57). It can launch rifle grenades from the muzzle.
A powerful and precise, but bulky and heavy weapon, it has been gradually replaced by the lighter SIG 550, and is now rare in active service.
The Stgw.57 was adopted for Swiss military service in 1957. The SIG 510-4 has been adopted by the Chilean and Bolivian armed forces. It is reported that the Chilean SIG 510-4 was actually manufactured in Italy by Beretta under contract to SIG.
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