SIG Sauer SIG516 Patrol 5.56 NATO – Custom AR-15 with SureFire WarComp, Carbon-Fiber Handguard & Geissele Trigger
This SIG Sauer SIG516 Patrol pairs the company’s proven short-stroke gas-piston system with a carefully selected set of premium upgrades. A SureFire WarComp flash hider, Lancer Systems carbon-fiber M-LOK handguard, Radian Arms Raptor-SD charging handle, and Geissele two-stage trigger turn this already respected rifle into a lightweight, low-recoil package ready for suppressed or unsuppressed use. The SIG516 Patrol line was discontinued around 2019, making this well-kept example a desirable find for shooters who value piston-driven reliability in an AR-15 format.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Good – Clean, well-maintained, minor wear marks.
Rifling: Good – Intact, well-defined lands and grooves.
This rifle presents only a few minor surface scratches and blemishes consistent with gentle use. The bore is bright and shiny, reflecting proper maintenance.
What's Included
- SIG Sauer SIG516 Patrol rifle with SureFire WarComp flash hider, Lancer Systems carbon-fiber M-LOK handguard, Radian Arms Raptor-SD ambidextrous charging handle, and Geissele two-stage trigger (installed)
- 1× 30-round Magpul PMAG Gen M3 polymer magazine
The heart of the SIG516 is its short-stroke gas-piston system, paired with a four-position adjustable gas regulator for normal, adverse, suppressed, and off settings. This arrangement keeps hot gas out of the receiver, helping the rifle run cooler and cleaner than typical direct-impingement designs.
The SureFire WarComp serves dual roles: it tames muzzle rise while nearly eliminating flash, and its 1/2-28 threads accept SureFire SOCOM-series suppressors without adapters. Paired with the Raptor-SD charging handle that vents excess gas forward, the rifle is optimized for suppressed shooting.
A Lancer Systems carbon-fiber handguard trims forward weight and stays cool under rapid fire. M-LOK slots and a full-length top rail provide flexible attachment points for optics, lights, or other accessories.
The installed Geissele two-stage trigger delivers a crisp, predictable break that enhances practical accuracy. Combined with a 16-inch chrome-lined, nitride-treated, free-floating barrel featuring a 1:7 twist, the rifle is set up for dependable performance with a wide range of 5.56 NATO loads.
Forged 7075-T6 receivers with Type III hard-coat anodizing, a six-position collapsible stock, and a Magpul MOE pistol grip round out a build that balances durability, control, and modularity—making this discontinued SIG516 Patrol a standout option for shooters who want piston reliability and premium components straight out of the box.