SIG516 G3 Launch: Short-Stroke Piston AR Returns with Modern Upgrades

December 16, 2025

On November 12, 2025, SIG SAUER introduced the SIG516 G3. The rifle brings back the company’s piston-driven 5.56 with modern controls, cleaner operation, and user-friendly tuning. It targets shooters who want duty-grade reliability with today’s ergonomics.

SIG516 G3: What’s New

The G3 keeps a short-stroke piston but adds an adjustable gas system for different ammo and suppressor use. It also uses rear and side non-reciprocating charging handles. Fully ambidextrous controls—safety, magazine release, and bolt catch/release—come standard. The free-float M-LOK handguard and Matchlite Duo trigger round out the package.

Core Specs at a Glance

Caliber: 5.56 NATO. Barrel: 16-inch cold-hammer-forged, 1:7 twist. Weight: ~7.7 lb. Muzzle device: SIG flash hider/comp. High-wear areas such as the cam path and feed ramp are steel-reinforced. Altogether, it’s a practical spec sheet for all-weather range work and defensive roles.

Why It Matters

Piston ARs remain a smaller slice of the market. However, some buyers prefer their cleaner running and steady performance across temperature, dirt, and heavy round counts. With the G3, SIG leans into that niche while updating controls to match today’s expectations. Additionally, the adjustable gas system should help users fine-tune recoil and ejection, especially when suppressed.

Where to Start on GunGenius

If you’re comparing options, begin with our semi-auto rifles category. You can filter by barrel length, features, and more to see how piston entries stack up against direct-impingement models. For brand ecosystem depth—magazines, service, and compatible parts—visit the SIG SAUER page. Finally, our broader rifles section helps you weigh alternative calibers and configurations.

Bottom line: The SIG516 G3 revives a known piston platform with modern controls and useful tuning. In short, it’s a timely option if you value cleaner operation, ambi ergonomics, and simple setup.