| 7.5mm Stgw. 57 / F. ass. 57 7.5mm | |
|---|---|
 Sturmgewehr 57 (Stgw. 57) | |
| Type | Battle rifle |
| Place of origin | Switzerland |
| Service history | |
| In service | 1957–present |
| Used by | See Users |
| Wars |
|
| Production history | |
| Designer | Rudolf Amsler |
| Designed | 1950s |
| Manufacturer | Schweizerische Industrie Gesellschaft (SIG) Swiss subcontractors |
| Produced | 1957–1985 |
| Variants | SG 510-1, SG 510-2, SG 510-3, SG 510-4, SG 510-5, SG 510-6, SG 510-7 T (SIG-AMT), PE-Stgw. 57 |
| Specifications | |
| Mass | 5.70 kg (12.57 lb) (Stgw. 57) 4.37 kg (9.63 lb) (SG 510-4) |
| Length | 1,100 mm (43.3 in) (Stgw. 57) 1,015 mm (40.0 in) (SG 510-4) |
| Barrel length | 609 mm (24.0 in) (Stgw. 57) 505 mm (19.9 in) (SG 510-4) |
| Cartridge | 7.5×55mm GP 11 (Stgw. 57) 7.62×51mm NATO (SG 510-4) |
| Action | Roller-delayed blowback |
| Rate of fire | 450–600 rounds/min |
| Muzzle velocity | 750 m/s (2,460 ft/s) |
| Effective firing range | 640 m (700 yd) iron sights 800 m (875 yd) Kern 4×24 optical sight |
| Feed system | 6-, 20-, or 24-round detachable box magazine |
| Sights | Front post, rear aperture |
The Sturmgewehr 57 (Stgw. 57 ) is a selective fire battle rifle designed by Schweizerische Industrie Gesellschaft (now SAN Swiss Arms) of Switzerland. The Stgw. 57 assault rifle uses a roller-delayed blowback system similar to the blowback system of the Heckler & Koch G3 (H&K G3) and CETME rifles. As an assault rifle, the model AM 55 entered service in the Swiss Army in three designations F. ass. 57 7.5mm (Fr: Fusil d’Assaut; Ital: Fucile d’Assalto 1957) and 7.5mm Stgw. 57 (Ger: Sturmgewehr 1957). Technologically, the Stgw. 57 was the mechanical and design basis for the export-variations of the SG 510 family of small arms. After thirty-three years, from 1957 to 1990, the Swiss Army replaced the Stgw. 57 with the SIG SG 550, a lighter-weight assault rifle.