The AT4 is an 84 mm unguided, man-portable, single-shot, disposable, recoilless smoothbore anti-tank weapon developed and manufactured by the Swedish company Saab. The weapon is designed to give infantry units a means to destroy light armored vehicles and fortifications.

The AT4 is a single use weapon and is not reusable and cannot be reloaded. The AT4 requires little training and is quite simple to use, making it suitable for general issue. It can fire several types of 84mm ammunition including HEAT (High Explosive Anti-Tank), HEDP 502 (High Explosive Dual Purpose), HP (High Penetration), AST (Anti Structure Tandem-warheads), ER (Extended Range) and HE (High Explosive).

The AT-4 has a firing range from 300 to 500 m and can penetrate 420 mm of armor. It can be fitted with an optical night sight on a removable fixture. In US military use, the launcher can be fitted with the AN/PAQ-4C, AN/PEQ-2, or the AN/PAS-13 night sights.

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