Update:

Homebrew sling out of a GP strap, 550 cord, and a German medical bag assy for that early 90's VTAC :)
Also ditched the zip ties for some electrical tape (much better)



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Finally got all the parts and pieced this together last night. I initially wanted to do an XM4, but it kind of morphed into a 727 BHD build ;)

Started as a LE trade-in 6520. I added the N1 stock, period correct Colt M16 BCG, sling swivel, Surefire 660 on Surefire M14 mount. Sling is a placeholder until I can find something period correct, or fashion something out of ALICE webbing and 550 cord.
I planned on refinishing in a custom mix of Norrel's Moly Resin to match the Colt dark gray, but part of me is digging the black anodizing.

Best part: I was going to just throw on a standard Colt 14.5 pinned barrel and call it a day. I found this one at a good price on the EE, and as it turns out, it's a legit RO727 barrel! LOL What are the odds?

That is truly beautiful! Congrats on the build. I've been looking for one of those flashlights and barrel mounts for a while. Nice work on the photos too.

That is great!

Ebay has the light mounts pretty regular.

And damn nice carbine, OP.

What sling would you guys throw on this?

Colt silent sling?

Retro field expedient sling, imo.
link

There is a thread in AR Discussions where ColdBlue says the Marines actually had normal ole M4's that had A2 uppers.   They were actually called M4's, not 727's.........



This is a super duper super duper awesomely great build.

Full fence lower, A2 upper, 14.5" M4 bbl, 3rd gen collapsible stock, 727.

Beauty.

Great looking cone. Colt lower is a great touch.

That's a mighty fine looking car-bean

That's freakin awesome! Great pics too