Nice to see some Falklands figures!
Regarding the equipment, The SAS, Royal Marine Commandos (M&A warfare Cadre), SBS and some forward artillery observers used the M-16 (there might even be more units that used them. I have seen pictures of military war corespondents using M-16`s) The thing to remember with regards to the M-16 they used in the Falklands is that they supposedly were of the earliest (AR 15) production and lacked the forward assist, so it has to be removed from the figures weapon. they also used the three-pronged flash hider instead of the "birdcage" flash hider.
Im a bit unsure about the carbines that were used if they were of AR 15 or M16 stock, but I guess they include the forward assist, the same with the combos with the M 203 grenade launcher.
-Sverre