Nice work!
I have some reference photos if you are still going to work some more on CAG HK416s or accesories. Their guns are now in FDE with every part in a different shade, buttstocks are B5 enhanced sopmods and magpul CTRs in FDE, 14,5 416s are fitted with longer SMR handguards. What is also pretty interesting, surefires are mostly mounted on 7:30 o'clock position without any offset mounts, probably screwed directly to the SMR's vent holes. https://drive.google.com/open?id=1ZvjGWZQl8QT-OztzLBrtzkHtXbfLz-E2