Just came across this thread... I am in a somewhat parallel project. I have a BRN4 lower and was interested in having the HK416 engraving done, but I am not having any success finding an engraver that has done the work before.
I understand this can be sensitive info, but I would really be grateful if someone could PM me a good engraver that can/willing to do the work.
Thanks in advance for any help.