I picked up a new Sig 716 308 Patrol rifle. I stripped and cleaned the rifle and lubricated per the owners manual. I started with Federal American Eagle 150 grain FMJ boat-tail ammo and loaded twenty rounds in the Magpul magazine that came with the rifle. The Sig 716 fired the first round and then jammed. I observed that the the bolt had failed to cycle properly and failed to strip the next round and the bolt had jammed against the case wall of the second round. I cleared the jam and fired a second time. Once again, the first round fired and second round jammed the same as the first time. I set the gas block to the maximum setting but the rifle continued to fail to cycle a second round. To rule out ammunition, I switched to Winchester Nato spec 147 grain FMJ. Exactly the same result after several attempts. To rule out lubrication issues, I stripped and cleaned the rifle and lubricated again per the users manual. This time I tried Speer LE Gold Dot 150 grain GDSP Duty ammunition. Same result as before. The Sig 716 fires first round and fails to cycle second round. All of the ammunition is new and cycles perfectly in my other 308 rifles. I'm very disappointed with this rifle. The Sig 716 is unreliable and I would not recommend purchasing this rifle. This is a real anomaly and I would appreciate any information about this issue from Sig Sauer or the user community.