FWIW, on Roto 0, some C8's showed up in the system with flat-top receivers (otherwise identical to the C8) and the troops took to calling them the C8A1 - though I never saw a rifle thusly marked...? The Det in Victoria still has a bunch of these at the armory - saw some there this spring.
The only place I've heard of those variants being referred to as C8A1 is on this website. Never heard any troops refer to them as anything other than C8, they were also marked as such.
They came issued with an Eotech 552.



















































