I've drooled over you rifle several times. It's very cool!
I didn't even notice. It's an awesome SBR.
I just wanted to add a bit to this topic:
I recently received a 16" Faxon GUNNER barrel, and, despite what the picture looks like on their website, the specs listed for it are correct; the gas block journal is 1.9" long, so there is enough room to pin an FSB. I was considering using their 20" GUNNER barrel as a more modern interpretation of the A1 pencil profile barrel. Here's the barrel I had in mind:
http://faxonfirearms.com/20-gunner-5...ngth-4150-qpq/
Now if only there were more gunsmiths willing to work with nitrided barrels...
Brownell's just jumped into the retro a1 upper game:
http://www.brownells.com/rifle-parts...20-174440.aspx
Yep, Brownell's is using raw a1 forgings from Nodak Spud to make their upper. Note it's also in black anodizing rather than the normal Nodak/Colt gray finish. Making a1 lowers too: http://www.brownells.com/rifle-parts...22-174441.aspx