[CSB]

This is about as authentic VN era you are going to find:

Colt AR-15
CAL .223
COLT'S PT. F.A. MFG. CO., INC. *
HARTFORD, CONN, U.S.A.

The circled Rearing Horse.

*(Colt's Patent Fire Arms Manufacturing Company, Incorporated)

The stamped sheet metal device in the Side View is a stripper
clip speed loader.

And if your buddy was a true friend, he would also give you some Chieu Hoi Bags to put the magazines in.