Strange Northern Ireland Grenade Launching Device, can you identify it?

[nzl1a1collector]

I was sent this photo today, its a frame taken from a Pathe News report from the 70's and shows two British Soldiers in NI, one carrying a Federal Riot Gun the other a L1A1 with a strange 'can' on the muzzle.

I would suspect the 'can' is a cup somehow fitted to a L1A2 Grenade Launching Device to allow the launching of Smoke and or CN (Tear Gas) grenades?

Dose anyone have any first hand accounts or information about this type of launcher? How was it made, what was it made from... where to find one?

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