Actually, it is identical in every way. There are actually three sleeves produced: a simon sleeve, a suppressor sleeve, and an M203A1 sleeve. The CF does not use the simon sleeve. The C8A3 uses the M203A1 sleeve which is machined from pre-hardened steel to resist the recoil and counter recoil of the 40 mm LV, and phosphate to the MILSPEC. Despite the fact that commercial users will never have an M203A1, there are no "commercial" versions made from mild steel like the counterfeit copies. The only difference in the barrel assembly is the M4 extension that will allow for better use of non-NATO standard commercial ammunition. The phosphate is identical, the heavy chrome, rifling, barrel markings, cold rotary hammer forged barrel, front sight forging, flash hider and improved 5.56 mm carbine chamber are all identical to the CAF version. The proof marks and makers marks are identical to current military production.
The only differences are:
The semi-auto only parts: disconnect, hammer, selector, lower receiver pocket, and the early commercial AR15 style carrier made to the Colt's drawings from a Canadian MILSPEC carrier. The selector is a Colt commercial semi-auto. The hammer is made from a standard C7/8 hammer, and the trigger and springs (and nearly every other component) is identical.
Deletion of the CF extended cocking handle and ambi-mag release;
Black MILSPEC glass fibre filled furniture, as green is no longer in production;
The police and export sling plate as the CF plate is no longer in production;
M4 MIL-STD-1913 upper and extension to allow for commercial ammunition and non-weaver scopes. Weaver scopes will still fit, but 1913 scopes would not fit on a Weaver upper;
The commercial Diemaco markings.