http://www.gunbroker.com/Auction/ViewItem.aspx?Item=377236540
What I am seeing here is a Sig 716 Precision with the UBR stock swapped out for something else, and the grip swapped out. Otherwise, appears the same to me. Great price too.
From the advertisement:
"The Sig Sauer 716 "3-Gun" is a non-cataloged rifle. This rifle has many features we have seen on the 716 Patrol including a 4-position piston operating system, flip-up front and rear iron sights, and a quad rail (albeit slightly longer). You even get the durable Magpul 20-Round PMAG, but two this time around compared to one in the Patrol rifle. The differences may not be easy to spot, however there are some notable upgrades which make this rifle stand out from the standard Patrol rifle (or other Sig Sauer rifles we have seen thus far).
First and foremost, this rifle ships in a very nice hard plastic case similar to the SSG 3000 case. New is the 18" Heavy Barrel which is threaded and includes a thread cap. This may very well be the same barrel we will find on the R716 'Precision Marksman' when it's eventually released. Next, a TI-7 stock with QD sockets on either side which you can use in combination with the included 2-point QD sling. This stock feels strong and sturdy - a fine addition to this rifle. Also welcomed is an upgraded latch on the charge handle to give a better grip, especially while wearing gloves. While on the subject of gloves, a Magpul Winter Trigger Guard sits nicely under the trigger. The guard is only the start as a raised letter 'G' is cast on the side of the new trigger, a hint that you will have something better than the standard Mil-Spec trigger found on all of the AR-10 and AR-15 style Sig Sauer rifles thus far. In place of this basic unit Sig Sauer has installed a Geissele 2-Stage Trigger which completes the 3-Gun package."