First time I ran into Colt Canada guns at a commercial trade show. Those who frequent Cansec and other defence shows might have seen the Gen 1 IUR million times already.
From what I was told, the commercial guns for Canada will most likely come with slick sided handguard with some built in rail spaces close to the muzzle end. The C8 IUR with 20" bbl will most likely be the direction the commercial guns heading. The idea is that user can buy extra rails if they want to. As far as I know, the 20" on display is more or less a prototype to test out the non-chromelined match version of the 20" barrel. 11.5" and 14.5" seem to be the most likely commercial offerings in the near future.
While the typical US guns tend to follow the typical government or M4 profile, Colt Canada's IUR does not need to cater to the US's appetite ( or the need to mount the legacy CF M203A1). Therefore, the IUR barrel profile tends to follow common sense instead of other imposed requirements. The barrel profile behind gas block appears to be of medium profile ( my guess is 0.78ish ), and if anything needs to thin out, it is done in front of the gas block like what it appears on the 11" model in the picture below. ( that seems to be about 0.65)
Another rarity is that the gas block is indexed to the barrel, so it cannot be rotated. The only other system that I am aware of having indexed gas block is the HK 416. The 2 set screws at the bottom only hold back the gas block from forward movement.
From what I was told, the commercial guns for Canada will most likely come with slick sided handguard with some built in rail spaces close to the muzzle end. The C8 IUR with 20" bbl will most likely be the direction the commercial guns heading. The idea is that user can buy extra rails if they want to. As far as I know, the 20" on display is more or less a prototype to test out the non-chromelined match version of the 20" barrel. 11.5" and 14.5" seem to be the most likely commercial offerings in the near future.
While the typical US guns tend to follow the typical government or M4 profile, Colt Canada's IUR does not need to cater to the US's appetite ( or the need to mount the legacy CF M203A1). Therefore, the IUR barrel profile tends to follow common sense instead of other imposed requirements. The barrel profile behind gas block appears to be of medium profile ( my guess is 0.78ish ), and if anything needs to thin out, it is done in front of the gas block like what it appears on the 11" model in the picture below. ( that seems to be about 0.65)
Another rarity is that the gas block is indexed to the barrel, so it cannot be rotated. The only other system that I am aware of having indexed gas block is the HK 416. The 2 set screws at the bottom only hold back the gas block from forward movement.



