SIG Sauer P556 – 5.56 NATO Pistol, Quad Rail, SB Tactical Brace – Swiss-Inspired Gas Piston System
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For a Limited Time: Buy a New P211, P320, M17 or M18 Handgun Between 10/15/2026 and 12/31/2026, Receive One (1) Allegiance Flag Supply 3' x 5' American Flag (SKU: MKT0678)
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EBERLESTOCK FADE SLING BAG CONSUMER PROMOTION
For a Limited Time: Buy a New P365 Handgun Between 10/15/2026 and 12/31/2026, Receive One (1) EBERLESTOCK Fade Sling Bag (SKU: PS9005602)
October 15 through December 31, 2026
Description
This SIG Sauer P556 pistol delivers classic SIG 550-series reliability in a compact, modernized package. Built around SIG’s proven short-stroke gas-piston operating system, the P556 offers exceptional reliability, reduced fouling, and smooth cycling compared to direct-impingement platforms.
The rifle-inspired steel receiver gives the gun a rugged, battle-proven feel, and the factory quad-rail handguard provides ample space for lights, grips, and other accessories. The pistol also includes an SB Tactical adjustable arm brace, making it compact, maneuverable, and well-suited for CQB environments and range use.
This example features a 5.56 NATO chamber, A2-style flash hider, full-length top rail for optics, and SIG’s distinctive Swiss-pattern controls. The markings on the receiver identify it as “P556, 5.56 NATO, SIG Sauer, Exeter, NH” with the serial TP 000522, confirming it as a USA-built variant based on the iconic SG 550 family.
Specifications
| Specification | Detail |
|---|---|
| Manufacturer | SIG Sauer |
| Model | P556 |
| Caliber | 5.56 NATO |
| Operating System | Short-stroke gas piston |
| Barrel | Compact profile w/ A2 flash hider |
| Handguard | Quad rail with numbered Picatinny slots |
| Receiver | Steel, Swiss-pattern design |
| Brace | SB Tactical adjustable arm brace |
| Magazine | 1 steel magazine included (appears 30-round pattern) |
| Sights | No sights installed (optic-ready top rail) |
| Serial Number | TP 000522 |
