I am looking to buy a good semi auto .308 rifle. I have narrowed my list down to Armalite's AR-10 Super SASS, Larue Tactical's OBR, or Knights Armament's SR-25 (or a M-110 if they ever get around to releasing that to the public). I am looking to find some firsthand knowledge and experiance on these weapon systems, both good and bad. Any info would be greatly appreciated: too long, too heavy, jamming and malfunction problems, problems with replacement parts, etc.