As far as I can tell, this upper is identical to the CANSOFCOM version with the exception of the blocky reinforced grenade launcher lug very rear of the bottom rail. UKSF retained this lug while CANSOFCOM opted to have it removed.
c8%20sas.jpg sas1.jpg sas2.jpg sas3.jpg
Hopefully additional images will become available in the near future!
PS. I also just posted about this "3rd Gen Colt Canada (SAS) IUR" in the C8/C7/L119 gallery thread. However, I thought it would also be prudent to post the pics here for anyone using this thread as reference for an IUR style build.