According to the the Gsg9.us Instagram account 4 days ago, the G36 clone receiver molds are now being used by S5 Tactical to make their SG-36. See some screenshots below:
The remarking you suggest (Model designation change, etc) must be done BEFORE you Form 1.Legality wise I wonder if it is possible to have the receiver remarked to what ever you want "hk g36" etc. After you form 1 it and have that match what you put on the paper work
Replaced lower group, back up and running. A very pleasant experience with hkpartsHKP is having a look a the lower. I'll report back