What optics for a Colt M16A1 carbine circa late 19

[abnrgr]

I'm getting a Colt M16A1 full-auto carbine ( model 653 )in the 9.5 million serial number range.I'm guessing that it's late 1970's. It has the fixed carry handle with hole for attachments. Can anyone suggest a period appropriate optic, military style, for this rig?

 

[BOLTRIPPER]

Re: What optics for a Colt M16A1 carbine circa late 19

here you go...all vintage COLT.....$250.00 plus insured shipping from 75248....LMK

 

[abnrgr]

Re: What optics for a Colt M16A1 carbine circa late 19

I want it.