as LAZ pointed out, yes 16" ARs in 308 are out there. I own 2 DPMS 308 (havent been able to shoot them since I am out of the cournty for work but that changes on FRIDAY, god I can not wait). The first is the 24" flutted bull and the other is a flutted 18" that is actually SHORTER than the 16" with flash supressor. kind of the bst of both worlds thing. I ordered my off of the net gun shops. But I want a 20tact 308 just because and it will make a good parts gun if it ever comes to it.
My new 18" 308, all I have is photos to look at and bills to cringe at. But I ordered a Luepold 2.5x8 MK4 M1 with ill TMR, laure mount, magpul rail covers, want a offset smaller CQB setup Jpoint ect.
Now to order a few rounds of ammo. Go money pits.
Here is the business end of the other. As soon as I get home and get everything put together I will update photos in the photo section.