In the 1990s the British SASR definitely used M16A2 (or Canadian C7) rifles with some fitted with M203s. One of my friends got his hands on them when the Brit SAS came to Australia for some desert training prior to Gulf War 1. He was fortunate enough to be one of the local troops assigned to assisting them while they were in Western Australia.
Forgot to mention, the M16A2(C7) were Safe-Single-Auto trigger groups and not the US Army's Safe-Single-Burst type
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