HK change their anodizing process recently?
Trying to mimic recent HK receiver coloring. While shooting emails with my smith we were perplexed with recent anodizing. They appear darker/greyer/greenish then past clear anodizing, like a slight die may have been applied. Looking at production M110a1 photos, Hk417a7, and BI code MR223a3, it seems they all share this. The color appears to be different from the photos on HK's site and real CAG rifles. Perhaps closer to the clone CAG rifles where the black ano was chem stripped then reanoed leading to a darker "clear".
links to what im talking about:
HK416A7 - Soldier Systems Daily
-new mr223a3 free parts kit from Zib BI code
I initially though it may just have been lighting (A7 in interior lighting and MR in the shade). But photos of the M110a1 in the sun from the H&k g28e csass thread also shows the receiver to be slightly different compared to CAG rifles (greyer instead of tan like the honey badger from Q).
So any chance an expert can chime in and confirm or dispel HK tweaked their anodizing process?