I'm in Singapore currently working with their Army.
They will be replacing the SAR-21 shortly -- ST Kinetic's has the maintenance contract on the small arms in the SAF -- but I don't think they are authroized to export - and the weapons are built by another part of the Singapore Defense Industry (SG I think?).
The SAR-21 is a select fire machine gun - not built in semi-auto. We have two in the collect at KAC, that Reed got a long time ago. Its not a good gun (never met a good bullpup anyway). I dont see how any guns could be exported for commercial sales - especially in Canada, due to both Singapore's firearms laws, as well as the fact they'd be at best converted auto's.