I posted on this recently in the AR-10/308 pics thread here:
I cannot recall now where I read/saw this, but I think I remember that LMT was interested in making these available for civilian purchase as a reference rifle (Not disputing comments from above, cuz it's just what I can recall, I'll update if I find reference). Couple notes about them (that could be changed in a civ mod): the piston is single position and not adjustable, so back pressure is real. Depending on the round, I'm getting a 1-2 o'clock ejection pattern with my Surge 7.62 in short config. I blew primers out of hornady match 168 gr ammo (2 for 2 attempts...stopped after a FTF on round three to find a primer cap in the breech). FGMM 175 SMKs are pretty awesome in this gun though. Right around 2450 fps with 175 gr out of the 16" barrel. Barrel is stamped 7.62 1/10 CB, it is not LMT's SS 5R barrel. Very reliably 1-1.5 MOA though and I'm sure a better shooter could see better results than me. Since this photo was taken, MAGPUL released their PRS Lite stock. It was a great add, but I would note it did not seat correctly with LMT's Sr-25 tube, so bought magpul's and swapped em out. Also, a little disappointed in the play in the stock once LOP is set, but I guess that's what you get in a PRS 'Lite' stock.
Final thought ... it's an LMT - overengineered and ROCK solid.