No worries mate it isn't my first rodeo to use an americanism! I've built a L119A1 before but it was an AEG and had the Diemaco traded G&P body, which made life easier. Ive already invested heavily in the WE GBB platform so money is on the low side and lasering was cheaper than engraving.
As much as we'd all love to see perfect L119 replicas not everyone has the budget to do so and you must also allow for a certain amount of creative differences due to so many types in use. As long as the basics are there and the owner is happy with their build then what is there to complain about? If someone stuck a photo of a bog standard M4A1 up in here then i could see that being an issue though