Got the itch to build a retro clone, so I bought the parts, and then an offer came up for another receiver, two bolts, and a charging handle that I couldn't pass up. Just wanted to verify that these are USGI M16A1 parts! Thanks!

BCG's marked with "C" and seemed to be parked:
Attachment 68835
Attachment 68836
Attachment 68837

Charging handle no markings:
Attachment 68838

SP1 upper, lightly parked, has what seems to be triangle markings near barrel attachment area but I can't make out what they are:
Attachment 68839
Attachment 68840
Attachment 68841
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