SG 540 — specifications, caliber, stats, review, photos | WeaponAtlas
The SG 540 is a Swiss 5.56×45mm NATO assault rifle introduced in 1977. It uses a gas-operated long-stroke piston system with a rotating bolt, and the base rifle was produced with either fixed or folding stock configurations depending on variant.
| Manufacturer | SIG Sauer |
|---|---|
| Year introduced | 1977 |
| Caliber | 5.56×45mm NATO |
| Weight (unloaded) | 3.520 kg |
| Length | 950 mm |
| Barrel length | 460 mm |
| Magazine capacity | 30 rounds |