The SIG Sauer SIG516 G3 Rifle (SIG part no. R516G3-556N-16B) is chambered in 5.56 NATO and also safe for .223 Remington, finished in black for a clean, standard look. It’s built around a 16-inch barrel with a black nitride finish and a fast 1:7 twist rate, threaded 1/2×28 to accept standard muzzle devices. It ships with a 30-round polymer magazine and comes without fixed sights, leaving the top rail open for the optic of your choice. This semi-automatic rifle measures approximately 36 inches overall, making it a solid, no-frills SIG-built option for the range or home defense.

Key Specifications

• Chambered in 5.56 NATO for reliable AR-15 performance.
• Also safely fires .223 Remington ammunition through the same chamber.
• Ships with a 30-round polymer magazine.
• Rifling twist rate of 1:7 suits heavier bullet weights.
• Threaded 1/2×28 to accept standard muzzle devices.
• 16-inch barrel balances maneuverability with reliable 5.56 velocity.
• Barrel is finished in black nitride for durability.
• Overall length of approximately 36 inches.
• Ships without fixed iron sights, leaving the top rail open for the optic of your choice.
• Semi-automatic action cycles with each trigger pull for fast follow-up shots.

Frequently Asked Questions

What caliber does this rifle chamber? 5.56 NATO, also safe for .223 Remington.

Does it come with sights? No fixed iron sights are included, so the top rail is open for mounting your own optic.

What’s the magazine capacity? It ships with a 30-round polymer magazine.

Buy the SIG Sauer SIG516 G3 Rifle

Want a SIG-built AR-15 with a black nitride barrel? Order this SIG Sauer rifle from our AR rifles lineup and we’ll ship it fast and insured to your local FFL from our Lubbock, Texas shop.