A1 style upper identification

[Spas-12 Owner]

The C7 came out in 1984 a few years after the release of the A2 and were for the Canadian military, also adopted by Denmark and the Netherlands. They were made by Diemaco/Colt Canada. They were not versions of the A1 or A2. They were a model all their own with features from the A1 and A2.

But the C7 wasn't only made by Diemaco and it's a version of A1 and A2 uppers

It is its own upper of course, however in common usage the C7 would fall under the A1 upper for it's lack of rear sight adjustments.