There is only one 416C in that firearm blog post. That’s the same prototype 416C, there’s a photo of a 10.4” 416 but that’s not a C obviously.There are actually two different C's in that Firearms blog post. One has the prototype upper. The other has the production version. Both appear to lack adjustable gas blocks. The Grey Room one is a B date code, are you suggesting that HK maintained production of C's into the B date codes?
To be clear, the only thing I am questioning here is if those C that were initially produced and sold (like Malaysia and one other contract), came with adjustable gas blocks.
Yes, the production 416C’s were BB and BC date coded. Every single one of them had adjustable gas blocks - England, Philippines, Malaysia, etc. - there are a couple more contracts that were filled.
I’ll post more pictures later - but here’s an English production 416C with the same adjustable gas block that came on the rest of them. Most of them had sling loops and no bayonet lugs.