Sig Sauer | SIG516 G3 5.56 NATO 16″ | R516G3-556N-16B-CP1-10

The SIG Sauer SIG516 G3 is a semi-automatic AR-pattern rifle configured with a 16-inch threaded barrel and ambidextrous controls for straightforward operation. The platform uses a short-stroke piston system with a free-floating M-LOK handguard and a Picatinny receiver rail for accessories. For optics, a durable variable 1-6x prism or low-power variable optic such as the Vortex Strike Eagle 1-6×24 pairs well under $1000 and suits both close-to-mid range work and deliberate shots.

Typical real-world applications include precision-oriented range training and competitive modern sporting rifle matches, where reliable gas management and modular accessory mounting are important.

Product Specifications

• The model is 516 G3.
• The caliber is listed as .223 Rem/5.56 NATO.
• The barrel measures 16 inches.
• The barrel is described as threaded.
• The action is Semi-Auto.
• The magazine capacity is 10 + 1.
• The rifle uses a short-stroke piston operating system (as noted in product materials).
• The handguard type is M-LOK free-floating.
• The stock type is Magpul.
• The controls are Ambidextrous.
• The twist rate is 1:7″.
• The grip material is Polymer.
• The finish is Matte.
• An accessory included is 1 Magazine.
• The UPC is 798681746125.

The SIG516 G3 combines piston-driven reliability with modern modular features such as M-LOK attachment points and a full-length Picatinny top rail, making it a practical choice for shooters who prioritize durability and accessory flexibility. Its 16-inch threaded barrel and ambidextrous controls provide a solid foundation for optics, lights, and stocks, supporting a variety of setups from precision-focused training rigs to competition-ready configurations.

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