@bayonet gravely slandered me.
True, I was a Viet Nam
ERA vet. USAF. {never set foot in the place} but was "borrowed" by an unnamed group which worked in strange places.
My photo was taken propped up on a 0-1 Bird dog, in my very sleek and fashionable "uniform" designed by me and made by one of the local Indian tailors, in the reloading revet in Phnom Penh, [where Nixon swore there were NO U.S. troops].
and.... as to the warm beer remark

; single malt Scotch was very available.
Back to the post. get a period "cone" aka nipple, and an original rear sight. IF you buy it !