Very nice find....what a great upper....do as Combat Jack & Desert_AIP suggest and contact VLTOR for the FA if you feel you want/need one.
If you are doing "press checks" at the dinner table and don't want to get frog lube on your thumb and then have to excuse yourself to wash up again
or if you want to silently close the bolt so as not to compromise your position & your sweat has a very acidic PH and you don't want a corroding thumb
print on your LMT enchanced $500 Gucci bolt carrier.....get the FA
I used mine daily/nightly in RVN back in the day when the VC were mounted on dinosaurs and so it became a habit ....I would not want an upper without one.....is it needed?....naw probably not... but for me at least old habits are hard to break especially when there is no real need to do so....
IMO