Rated 5 out of 5 by John 69 from Awesome rifle!! Got my first one for about 2 and a half years ago. Got about 6500 rounds through it. I know I fired 2000 in 2 days at one point. Never had so much as a hiccup. Eats any ammo i can force into it and loves my Aimpoint PRO. Runs so well I bought a 14 inch and 10 inch upper for builds and they run flawlessly. They eat anything I feed em and hit everything I shoot at. I heard about transition issues with Sig but I havent seen anything I dont like so far. My 10 inch is now my "go to" gun. Love my 320 as well! The Negative- Dont like the hand guard. It leaves the gas block exposed and the block gets very hot. Not much for aftermarket choices either.

Rated 5 out of 5 by IRVEN_RVR from Heavy Duty exellent Rifle I think it is one of the best rifles created on the AR15 platform. It is used by our armed forces as those of other countries. Its Piston system is unique. It is a bit heavy but in case of emergency you can face any scenario and you will never fail this always giving it its good maintenance and you can pull with it till you get tired and it will not give you problems the rifle does not fail in water neither with the sand nor in the Sea has never given me problems endure any situation without problems. It is precise and it is built with excellent quality materials I surpass all my expectations I do not really regret the investment I think it was one of the best purchases I could make.

Rated 5 out of 5 by Deadeye from Solid performer After 24 years in Uncle Sam's Army, I had experienced much joy in cleaning M16s and M4s. I decided I would give a piston-operated gun a go and After one season I am never going back to a DI gun. Cleaning my Sig is just so painless: wipe off the bolt carrier every session or two and clean the piston every 4-6 weeks and the gun runs flawlessly. Shooting a variety of 5.56 and .223, I have yet to experience any FTF, FTF, or FTE. To aid my aging eyes, I mounted a Nikon P-223 in a Nikon one-piece mount and it is a very nice rig to shoot all afternoon at the range. Another reviewer complained about Sig only shipping with one magazine; magazines are inexpensive in the aftermarket and it simplifies packaging for Sig. So by another magazine (or 2 or 3 or 4...).

Rated 2 out of 5 by Chris996 from Really disappointed ☹️ I had really high hopes, especially after purchasing an MCX Virtus recently before purchasing this 516 Gen 2. I could not get this rifle to group at 25 yards with iron sights or an EOTECH. I cleaned and inspected the rifle and returned to the range with the same results, even with different ammunition. I checked the head space today and the bolt closed with a No Go .223 gauge. I then removed the hand guard per the owners manual to see if the barrel but was loose. Unfortunately, one of the helicoils in the hand guard pulled out of the hang guard. I was looking at the torque spec in the manual and the screws are way over torqued when new.

Rated 5 out of 5 by Brandon from Great Rifle The build quality is excellent as you would expect from Sig. Shoots nice and smooth, without a single malfunction so far using relatively cheap range ammo. The included Magpul accessories and flip up backup sights were a nice addition. With the difficulty of finding 30rd magazines, I wish they would have included more then 1 mag. Other then that minor gripe, I'm very happy with this rifle, and Sig Sauer in general. So much so that I've changed my "list" and am now looking at picking up the Sig 716 for a longer range platform.

Rated 5 out of 5 by MajorDood from Solid AR! MajorDood This was a throughly researched purchase. I had been looking at the Sig Patrol 516 for 3 years, on and off. Even though this was a premium priced rifle, I thought it had a lot of value added features. My optics lined up (Sig Romeo 5/Juliet 3). Have about 300 rounds through it, NO malfunctions. The rifle has many features- gas piston (stays clean in the receiver), 1:7 barrel, upgraded furniture, Sig reputation,not much needed to add. The trigger was not as bad as I expected, from reading countless reviews. Have only sighted in at an indoor range at this point, due to weather, but look forward to some long range shooting. Only bugaboos, were that, since my initial research, Sig no longer included iron sights, extra mags, or sling.

Rated 5 out of 5 by SUPERMOOSE from The perfect AR I have owned this Sig Sauer 516 since either 2012, or 2013 (currently Nov, 2019), and it is my absolute favorite. 100% reliable, and also very accurate, for an AR. I’ve seen multiple sub-half MOA groups out of this rifle (AFTER replacing the trigger), with factory ammunition. This rifle is responsible for my love of MSR style rifles, and even though I own multiple others, the Sig is still my overall favorite. Reliable, accurate, clean running, and it’s an AR... I literally could not ask for a better factory built rifle.