SIG 510

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Sturmgewehr 57/SIG 510
Fass 57
Type	Battle rifle
Place of origin	Switzerland
Service history
In service	1957-Now
Used by	Switzerland, Chile, Bolivia
Production history
Produced	1957-83
Specifications
Weight	5.56 kg
Length	1105 mm (1016 mm SIG 510-4)
Barrel length	583 mm (505 mm SIG510-4)

Cartridge	7.5x55 mm GP11 (Stgw.57) or 7.62x51mm NATO (SIG 510-4)
Action	roller-delayed-blowback
Rate of fire	600 rounds/min

The SIG 510/Sturmgewehr 57 is a battle rifle manufactured by SIGARMS (now SAN Swiss Arms) of Switzerland. It is based on the same roller-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 rare, but still in active service.

The Sturmgewehr 57/SIG 510-1 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.