Home » Shop » Sig Sauer 516G3, AR, 5.56 NATO, 16″ Threaded Barrel, Black, 30 Rounds
Home » Shop » Sig Sauer 516G3, AR, 5.56 NATO, 16″ Threaded Barrel, Black, 30 Rounds
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$2,759.98Original price was: $2,759.98.$2,179.00Current price is: $2,179.00.
🚚 Ships to your local FFL — order online, put your FFL dealer’s name and address in the Order notes box at checkout, and we coordinate the rest. Most firearms ship same or next business day. How buying a gun online works.
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Sig Sauer 516 G3 is a semi-automatic AR rifle chambered in 5.56 NATO with a 16" threaded barrel and a 30-round capacity. It suits shooters who want a short-stroke piston AR with an adjustable gas system for range days, home defense, or general use.
Chambered in 5.56 NATO
16" barrel with 1/2×28 threaded muzzle
30-round capacity, semi-auto action
Short-stroke piston with adjustable gas system
Ambidextrous controls, Magpul polymer stock
Matte black finish
SKU: SGR516G3-556N-16B-CP1 · Mfr part #: R516G3-556N-16B-CP1 · UPC: 798681746118
The Sig Sauer 516 G3 is a semi-automatic AR rifle chambered in 5.56 NATO with a 16″ threaded barrel. It builds on the 516 series, which Sig Sauer designs and builds in New Hampshire. The finish is matte black, and it holds 30 rounds.
The big difference from a standard AR is the operating system. The 516 G3 uses a short-stroke piston instead of direct impingement. The gas system is adjustable, so you can tune it for different loads or for running a muzzle device. Sig also uses steel-reinforced components in high-wear areas.
Controls and handling
The controls are fully ambidextrous. You get a charging handle at the rear and another on the side, and neither one reciprocates. The stock is a Magpul polymer model that adjusts. The trigger is the Matchlite Duo with a curved shoe, and the free-floating M-LOK handguard leaves room to mount accessories.
This rifle suits shooters who want a piston AR out of the box, whether for the range, training classes, or a home defense setup. It also works for anyone who wants a platform to build on.
For gear, think M-LOK lights, a sling, a vertical grip, and an optic. The muzzle is threaded 1/2×28, so it accepts other muzzle devices that use the same thread. Add extra 30-round magazines for longer range sessions.
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: What caliber is the Sig Sauer 516 G3?
A: 5.56 NATO. It is a semi-automatic rifle with a 16" barrel and a 30-round capacity.
Q: Is the Sig Sauer 516 G3 barrel threaded?
A: Yes. The 16" barrel has a 1/2×28 threaded muzzle, so it accepts muzzle devices that use that thread.
Q: Does the Sig Sauer 516 G3 use a piston or direct impingement?
A: A piston. It uses a short-stroke piston with an adjustable gas system, so you can tune the gas settings.
Q: Is the Sig Sauer 516 G3 ambidextrous?
A: Yes. The controls are fully ambidextrous. It also has a non-reciprocating charging handle at the rear and one on the side.
Q: How many rounds does the Sig Sauer 516 G3 hold?
A: 30 rounds. That is the magazine capacity for this semi-automatic 5.56 NATO rifle.
Warranty and Manufacturer
Covered by the Sig Sauer factory warranty; warranty terms come from Sig Sauer.
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