I said before that my AR-15 A2 Sporter II rifle was a lot like a Colt Canada (Diemaco then) C7 rifle issued to the Canadian military. It was also issued to British Special Forces, Pathfinder Platoon, and Brigade Patrol Troop (BPT). It beat the SA80 bullpup they were otherwise stuck with. So, how close are these 2 rifles? Mine is semi-auto only instead of select-fire, of course. It has the Colt large pivot pin with screw heads on both sides, which I replaced with a quick release pin a long time ago. Since it doesn't have a normal pivot pin, it doesn't need a pivot pin retainer and spring, or a place to fit them in the receiver. So the lower is a slab-side, with no fence around the mag release either. Other than that, it's pretty much the same thing, which is more like an M16A1E1 than an M16A2.
Diemaco changed the trapdoor in the buttstock to allow easier access to the storage compartment inside the stock. The carrying handle and rear sight assembly are an M16A1 style two aperture L-type flip rear. But the sights they came up with were slightly different from mine. Mine had an A2 post instead of a slimmer tapered round post. And it had a normal rear aperture without a ghost ring, but I replaced it with a ghost ring when I put a tritium front sight on. Wikipedia says Diemaco used a 1 in 7 inch rifling twist hammer-forged chrome-lined barrel with a slightly reducing bore diameter over the length of the rifling to increase longevity and accuracy. Mine is 1 in 7" twist chrome lined Colt barrel and that's all I know. The upper has a brass deflector like an A2 rifle but is otherwise all A1. They both have the A2 flash hider, barrel, handguards, delta ring, pistol grip, forward assist, and stock with a spacer in it.
So there was a minor difference in the sights I didn't know about, in addition to the different pivot pin. They're still a lot more alike than different.
https://en.wikipedia.org/wiki/Diemaco
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