SIG516 (SIG Sauer 516)


Sig Sauer 516 Gen2 14.5″ Barrel Upper Receiver Assembly, Semi-Auto. The SIG516 14″ upper allows operators to upgrade their current AR-15/M16/M4-type rifles from direct gas impingement systems to the SIG SAUER advanced short-stroke pushrod system. This advanced operating system reduces carbon fouling, excessive heat, and unburned powder in the action, ensuring reliability and function that is unmatched. 1/7 twist, 1/2×28 threading, 5.56 NATO chamber. These uppers are 14.5″ and need to be used on an NFA or pistol lower. Includes BCG and Charging handle. For best results use an H buffer (not included).


The SIG516 is a Swiss-German assault rifle developed in the 2010s from the AR-15 platform. Also, the 516 comes in multiple paint schemes including FDE. However, one of the most tested and proven weapons systems in the world achieves ultimate refinement with the introduction of the SIG516 rifle. Furthermore, with its chrome-lined, phosphated, military grade barrel and adjustable, four-position gas regulator, the incorporates all of the most desirable mechanical improvements. However, add to these a free-floating quad rail forend and barrel, and you have the most advanced, versatile AR-based rifle available.

    • Gas piston operating system
    • Four-position gas regulator
    • 5.56 x 45mm NATO
    • Free-floating military grade chrome lined barrel
    • M1913 Picatinny flat top upper
    • 7075-T6 Aircraft grade aluminum upper & lower receiver with hard coat anodize finish

sig516 fde

The SIG516 is a semi-automatic multi-caliber rifle, intended for civilian and law enforcement markets. Also, the same family also includes selective-fired (single shot, 3 shot burst, full automatic modes) sporting rifles, strictly intended for law enforcement and military use. Furthermore, it fires from a closed bolt and has a short-stroke pushrod piston system. Also, the gas piston pushes the bolt carrier rearward, where it is returned to the forward and locked position by a spring. Moreover, this process loads the next cartridge. However, the 516 has a four-position gas regulator, allowing the user to choose the amount of gas directed to the piston.


SIG516 Specifications

  • Caliber: 5.56mm NATO
  • Barrel Length: 16”
  • Action: Semi-Auto
  • Operating System: Short stroke pushrod Rotating bolt
  • Rifling: 1 in 7 in.
  • Trigger Type/Weight: MIL-SPEC 7.6 lbs
  • Overall Length: 35.7”
  • Magazine: 30 Round Aluminum


sig516 price

It has a safety lever on the left side, to be used by the thumb of the shooting hand. Also, the gas block integrates an adjustable gas regulator. However, the front gas block is railed to accept the front sight with a flip-up sight post. Moreover, SIG models are equipped with an M16A2 style bird-cage flash hider.

The 5.56×45mm NATO SIG516 models accept AR-15 style box magazines. SIG516 Russian rifles must use a different magazine, as they are chambered in 7.62×39mm. The SIG516 Russian uses magazines designed for 7.62×39mm AR-15 style rifles.


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