Received my 416 C a few days ago.
Not withstanding the Specna markings and lack of H&K markings and the overall matte black finish (some grey would be nice), as well as the incorrect flash hider (bought a correct one from VFC), externalwise it's a nice gun. Heavy and hefty. it came with a broken forward assist button, though. That's a first.
Shoots very nicely, good hop up, good ROF for a small 7.4V at 400 FPS. PEQ-15 battery case is realistically sized, because the battery is so small. Love it.
Bolt release works, selector clicks smoothly, but the sliding stock is a nightmare: it came in switched upside down and you need to push the levers on both sides for it to work. It's so hard, you need to put the gun down to fully extend it. Now it wont stay in the closed position, but it's so stiff it doesnt move on its own.
Another problem are the magazines, they are propietary: instead of a square hole in the mag for the mag catch to hold on to, there's no hole, but rather two protusions.for the mag catch to hold on to. Basically VFC compatible, but won't take regular AEG mags like Dboys, Cyma, KA, etc.
Also, it includes a quick spring change GB. Not the SAEC system, but it's still quicker than a regular AEG.
All in all, I am happy with the purchase, but for that price I would expect the stock to perform better. And how the frward assist button could break is a mistery to me.