SIG 716 Chambered in 7.62x51mm/.308, this piston driven AR has been called the “Poorman’s HK MR 762”, which is another piston driven, 7.62x51mm/.308 AR. One major advantage the 716 has over the MR 762 is that it can use standard AR-10 mags. Pre-Sandy Hook, they were selling for $1,700~. During the panic buy, they were going for $2,500 to $3,000. Now, they’re actually kind of stable price wise, you can still find some at $1,700~. I was considering buying one last year November, might still buy one sometime later this year.