SR-556/6.8 stats from Ruger:
Caliber: 6.8 SPC
Stock: Black synthetic, collapsible
Weight: 7.75 lbs.Height: 7.75"
Overall Length: 32.75" - 36.00"
Barrel Length: 16.12"
Twist: 1:10" RH
Length of Pull: 10"25" - 13.50"
The Ruger SR-556/6.8 features a two stage piston with adjustable regulator, quad rail handguard, Troy Industries Folding Battlesights, 6-position M4-style buttstock, Cold hammer-forged chrome-lined barrel (MIL-SPEC 41V45), Hogue pistol grip, chrome plated bolt, one-piece bolt carrier and extractor, rail covers, 3 magazines (2x25 rd, plus 5rd), and a soft case.
Looks sexy, but the price point is likely to keep it out of the average AR fan's gunsafe. I'll be keeping my eye on this one, though. The intriguing piston design and 6.8 SPC chambering are not to be overlooked.