SA stamps/markings

[twoshots]

I have read the stickies and still have a couple questions re. springfield/usgi components

are all 3rd gen springfield m14 mounts marked springfield or do some just say "m1a m14", are they steel or aluminum (1st gen are aluminum)

same question regarding ident. markings on sights and action components coming from springfield or USGI

thanks