Thanks for the information and observations for the Remington bankruptcy inventory. I obviously haven't seen the G prefix example with the M24 type finish you described. From that info, it sounds like there must have been was a spec change at some point.
I've observed a number of examples:
- a complete factory assembled G prefix XM2010 that has a matte black oxide type coating like you describe,
- several RR prefix 2010 barreled receivers with the same matte black finish,
- a lot of US C prefix receivers that have FOIA responses showing initial use as M24's, return to Remington for rebuild as M2010's, and documentation showing issued as M2010's. Those US C prefix receivers have the matte black finish too, not the thick Rem-Tuff coating.
I also looked at a lot of older pics and videos. This video has some good clear shots of the bolt starting at about :30 and then around 1:20-1:40. Definitely no M or 2 tone bolt.
This one also has some good clear shots of the bolt and receiver finish.
I agree that we are likely seeing a mix of M2010 parts and assemblies from the US contract, law enforcement and commercial sales, and even other foreign military production. That mix makes it especially hard to tell what parts were intended for which contract or client.
Great info, thanks!