I've had three semi-auto .308 rifles in the past but somehow ended without any of them.
The first was a converted Russian Saiga with a 22" barrel. The rifle was very reliable and ate any ammunition I cared to run. It was accurate enough for any hunting purposes. What I didn't like was it was a bit heavy and it was very hard on the cases I had hoped to reload.
My second was a DPMS Recon 308. I actually never had an issue and should have just kept it. I sold it to get in on what I thought was a good deal on rifle #3.
My third attempt was a Sig 716. Wal Mart was closing this out last summer, so I thought I'd give it a try. I never had any of the problems that some folks had mentioned on the Sig forum and it ran flawlessly through about 300 rounds. Using the same SWFA 3-9x42 I had on the DPMS, it wasn't quite as accurate as the Recon; but still a bit better than the Saiga was. However, it was even heavier than the Saiga, and it only had a 16" barrel. I only took it in the field twice before I was done. It was fine shooting from a bench, but it weighed almost 9 1/2 pounds without optics. I passed in onto a a heavy metal three gunner and he loved the heavy rig.
I had almost given up on a semi-auto 308 except I have about 400 rounds of 7.62x51 ammo and four new PMAGS that I didn't want to go to waste.
By chance, I found the following offer and thought it might be worth a try: http://palmettostatearmory.com/index.php/smith-wesson-m-p-10-308-7-62x51-nato-811308.html
I read up for an hour or so, but didn't want to hesitate and have it sold out. Looks like I'm going to give the platform one more try. I hope this one works out.