Is there anywhere a little more local than KYAirsoft that does an L119A1 marked receiver for the WE M4 or anywhere that engraves receivers? I’m looking to buy one, but the delivery times from Asia are still around a month or so.
LCS engineering can do the engraving for you, they can also do all the machining for the extra mods needed on the upper, buffer tube and shorten your barrel to the correct 10" and mod your front site if you are doing the short version. They did the machining on my A2 aeg build and my WE GBBR receiver is off to them next week.
The engraving is about £50 from memory and of course you will end up with a unique serial number. There is a bit of a waiting list but Jim will give you the details.