The Feedtray cover and barrel look good.
The mount... Not being Navy, it it unfamilar. That appears to be a special iron 4 coating.
The ammo: OMG!
Maybe the photographer found it somewhere?
As others have pointed out the "GI gold" is on the mount
not the M2.
I am amazed that such crappy ammunition is being used.
I wouldn't want to cycle crap like that through any
weapon in my care.