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SIG Sauer P556xi Classic PSB Handgun

Item # 914319
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Additional Information:

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  • To buy online and deliver to a Gander Mountain store or an Independent Firearms Dealer, simply add this item to your cart. Click here for additional details.
  • Firearms shipping charge of $25.00 per item.
  • You must be at least 21 years old to purchase this item. State and local laws may vary.
  • Additional discounts do not apply.


  • Modular Design

  • Full-Length Picatinny Top Rail

  • Ambidextrous Controls

  • S15 Stabilizing Brace

  • Locking Flip-Up Sights

Product Summary

The evolution of the SIG556 platform, the SIG556xi provides shooters with unparalleled modularity in barrel length, caliber, magazine type, and stock configuration. Utilizing the time-tested rotating bolt and adjustable gas piston operating system, the SIG556xi system allows operators a choice of caliber, barrel length, handguard/stock configurations and lower receivers. A removable barrel allows the operator to select the necessary length for a given mission. Adding the appropriate bolt, the SIG556xi can be changed to any of three calibers, 5.56x45mm NATO, 300 Blackout, and 7.62x39mm NATO. Users can also quickly change out the non-serialized lower receiver, allowing the use of either AR-style STANAG magazines or rock-and-lock AK-style magazines. The SIG556xi upper receiver is the serialized part, making the lower an easy to purchase part. Polymer handguards accept all Magpul light and rail kits and the aluminum and carbon fiber handguards accept 2", 4", and 6" M1913 rails. Truly ambidextrous, the SIG556xi features an ambi safety selector, magazine release, and user swappable charging handle (right- or left-handed).

The P556xi is the pistol configuration of the 556xi that's ATF compliant. SIG's SB15 Stabilizing Brace ensures improved accuracy and reduced recoil compared to other AR-style pistols. The unique design uses the forearm to provide a natural and comfortable rest for shooters of all sizes and physical ability. The Classic variant comes chambered for 5.56mm NATO rounds. Locking flip-up front and rear sights are included.

Model P556xi Classic PSB
Type Handgun
Action Semi-Auto
Caliber .223 Rem./5.56 NATO
Barrel Length 10.0"
Weight 6.8 Lbs.
Sights Flip-Up Post/Flip-Up Adj.
Finish Black Nitride
Grips Black Synthetic
Safety 2-Position Thumb
Capacity 10 + 1


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