SIG Sauer SIG522 .22 LR – Discontinued Semi-Automatic Rifle with ROMEO5 Optic

Offered for sale is a SIG Sauer SIG522 semi-automatic rifle chambered in .22 Long Rifle, featuring black synthetic furniture, a folding stock, and a mounted SIG Sauer ROMEO5 red-dot optic.

The SIG522 was developed as a rimfire counterpart to the SIG 550-series rifle family, incorporating similar external styling and handling characteristics in a dedicated .22 LR platform.

This example features a black folding skeletonized stock, full-length polymer handguard, top-mounted Picatinny rail, and the distinctive receiver profile associated with SIG’s 550-series firearms.

The rifle is marked:

SIG522 – SIG SAUER INC. – EXETER, NH, USA

With SIG522 production discontinued, these rifles represent an earlier generation of SIG Sauer’s American-market rimfire firearms.

SIG Sauer SIG522 – A Unique .22 LR Rifle

The SIG522 combines the recognizable appearance of the SIG 550-series platform with the practical characteristics of a semi-automatic rimfire rifle.

Unlike its centerfire counterparts, the SIG522 uses a dedicated .22 LR blowback operating system.

The rifle was designed to provide familiar rifle-style ergonomics while utilizing the widely available .22 Long Rifle cartridge.

Its distinctive design separates it from more conventional rimfire rifles such as the Ruger 10/22 and Smith & Wesson M&P15-22.

Folding Stock and Black Synthetic Furniture

This particular SIG522 features a black synthetic folding skeletonized stock.

The stock incorporates the distinctive triangular profile associated with the SIG 550-series rifle family.

Additional visible features include:

• Black polymer pistol grip with textured finger grooves
• Full-length black polymer handguard
• Receiver-mounted Picatinny optics rail
• Folding rear stock assembly
• Military-style receiver controls
• Front sight assembly
• Slotted flash hider

The folding-stock configuration gives the rifle the recognizable appearance of the original SIG 550-series design.

Includes SIG Sauer ROMEO5 Red-Dot Optic

An important feature of this SIG522 is the included SIG Sauer ROMEO5 red-dot sight.

The optic is mounted on the rifle’s receiver-mounted Picatinny rail.

The ROMEO5 is a compact electronic sight designed for rapid target acquisition and is a popular accessory for modern sporting rifles.

The optic is clearly marked SIG Sauer ROMEO5 in the provided photographs.

The mounted sight complements the rifle’s military-inspired appearance while providing an alternative to traditional iron sights.

Optic function, battery condition, and zero have not been independently verified.

SIG Sauer Exeter, New Hampshire Markings

The receiver is marked:

SIG522, SIG SAUER INC., EXETER, NH, USA

These markings identify the rifle as part of SIG Sauer’s American-market SIG522 product line.

The SIG522 is a discontinued model and should not be confused with the centerfire SIG 556 or the current SIG MCX series.

 

SIG Sauer SIG522 Specifications

Condition

This is a used SIG Sauer SIG522 .22 LR rifle.

Based on the photographs, the rifle retains its original-style black synthetic furniture, folding stock, and military-inspired configuration.

The receiver markings remain legible, and the rifle is equipped with a SIG Sauer ROMEO5 optic.

The photographs show some normal cosmetic signs of previous handling and use.

Please review all photographs for the exact cosmetic condition and configuration.

The actual rifle pictured is the firearm offered for sale at GunsmithLive.