The Heckler & Koch AG36 is an underbarrel single-shot grenade launcher developed and manufactured by Heckler & Koch. It is designed as an attachment for the G36 assault rifle.

It is used by the British Army under the designation L17A1 and L123A2 UGL (Underslung Grenade Launcher). The L123A2 UGL is used on the L85A2, while the L17A1 is used on the L119A1 carbine (C8SFW).

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