Sig Sauer SIG516 Patrol Gen 2 5.56mm 16" Short-Stroke Piston AR-15 Rifle
The SIG516 Patrol Gen 2 stands out for combining Sig Sauer’s proven short-stroke piston system with a bullet-button magazine release. Built around a cold-hammer-forged, chrome-lined barrel and a four-position adjustable gas regulator, this discontinued Gen 2 model delivers reliable performance in a configuration authorized for sale in restrictive states. Its free-floating quad-rail handguard, flip-up sights, and threaded muzzle round out a feature set that appeals to shooters who need durability without giving up modularity.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent – clean, mirror finish, no signs of wear.
Bore Rifling: Excellent – sharp lands and grooves.
Specific Condition Notes: The upper and lower receivers exhibit scattered scuffs and scratches consistent with normal use.
What’s Included
- SIG516 Patrol Gen 2 rifle
- 1 × 10-round steel magazine marked “MS 10”
- Polymer vertical fore-grip (installed)
- Flip-up front and rear iron sights (installed)
This SIG516 uses Sig Sauer’s short-stroke piston system, reducing fouling in the action and adding reliability under hard use. The four-position adjustable gas regulator lets you tune the rifle for standard, adverse, suppressor, or off settings, and it is rated to fire immediately after full water submersion—Sig’s “Over-the-Beach” capability.
The 16 inch barrel is cold-hammer-forged, chrome-lined, phosphate finished, and threaded 1/2-28, giving the shooter a durable bore and the option to add compatible muzzle devices. A free-floating aluminum quad-rail handguard (Generation 2 design) offers ample space for lights, lasers, and accessories while preserving barrel harmonics.
Compliance is addressed with a factory-installed bullet-button magazine release and a 10-round steel magazine, allowing legal ownership without aftermarket modification. The collapsible polymer stock and Magpul pistol grip provide an ergonomic fit for a wide range of shooters.
Forged 7075-T6 aluminum receivers, black hardcoat finish, and flip-up iron sights complete a package that remains serviceable and adaptable even after the model’s 2019 discontinuation.