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Sig Sauer 516 Gen2 Upper Assembly - 7" 5.56mm NATO (Full Auto)

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Sig Sauer 516 Gen2 Upper Assembly - 7" 5.56mm NATO (Full Auto)

Sig Sauer 516 Gen2 Complete Upper Receiver, 5.56mm NATO, 7" BBL - NFA Rules Apply (Full Auto Capable)

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Availability: Discontinued


The SIG516 uppers allow 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. A standard 5.56mm NATO chrome-lined chamber and bore ensure reliable function in any environment.

All models feature a free-floating, aluminum, M1913 quad rail and 1:7 right-hand twist bore configuration. The 7” uppers feature short heavy barrels.

An adjustable gas valve allows operators to increase the flow of gas when using lower pressure ammunition or when adverse conditions require additional energy. Reduced flow and the off-position enhance the use of suppressors. Barrels feature an A2 flash suppressor and are threaded ½x28 TPI, allowing the SIG516 to adapt to a number of aftermarket accessories and suppressor mounts.

All upper assemblies are shipped with a recoil buffer and action spring. These components must be installed to ensure proper function of the SIG516 upper assembly on your AR-type lower receiver.  This receiver is full auto capable when mated to a select fire lower receiver.  Putting this receiver onto a semi-auto lower receiver will NOT convert that firearm to full auto.

Note: All NAFA rules apply.

Specs - More Info
Additional Info
UPC Code 798681441594
Caliber .223 / 5.56
Manufacturer Sig Sauer
Barrel Length (in) 7"
Accessory Rail Yes
Additional Info All NFA Rules Apply. Mounting this on a rifle lower will create a short barrel rifle. It is fine to use on a pistol lower.
Warranty Warranty provided by Sig Sauer. Warranty information is available for Sig Sauer products at
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