The L9A1 51 mm Light Mortar is a man-portable mortar system used by the British Army. Smoke, illuminating and high explosive bombs are available. A short range insert device allows the weapon to be used in a direct fire mode. The 51 mm mortar, which replaced the World War II-vintage 2 inch mortar, was due to be phased out by the use of the 40 mm L17A2 UGL (Under-slung Grenade Launcher) mounted on the L85A2 however operational experience has led to the decision to replace it with a 60mm Mortar The 630 60 mm Mortar has been procured as a Urgent Operational Requirement (UOR) to replace the current 51 mm Mortar on current operations.
Ammunition for the 51 mm mortar has a small, ring-pull safety pin on the side of the nose-fuze. The fuze remains unarmed until the pin is withdrawn. Therefore, the safety pin must always be removed and discarded before a mortar shell is fired.

Specifications

    Calibre: 51.25 mm (2.02 in)
    Weight:
        Complete: 6.275 kg (13.8 lb)
    Length of barrel: 700 mm (27.5 in)
    Range: 750 m (820 yd)
    Rapid Rate of Fire: 8 rounds per minute
    Bomb weight:
        Illumination: 800 grams (1.76 lb)
        Smoke: 900 grams (1.98 lb)
        High Explosive: 920 grams (2.03 lb)

Photos from British Club dot org dot ua