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Sig Sauer SIG556



Sig Sauer SIG556 Classic SWAT 5.56mm Rifle

Sig Sauer SIG556  Specifications

  • Item Number: R556-16B-CS-RD
  • Caliber: 5.56 x .45mm NATO
  • Overall Length: 35.875 in
  • Barrel Length: 16 in
  • Rifling: 1 in 7 in
  • Number of grooves: 6
  • Weight w/out Mag: 8.2 lbs
  • Mag Capacity: 30 Rounds
  • Accessory Rail: Yes
  • Features: Quad rail and Rotary Diopter Sight

Sig Sauer SIG556 family of rifles use a gas-piston operating system, a superior system to the gas impingement arrangement in my book. The piston means that weapon doesn’t dump all of its waste (burnt gasses and carbon residue) into the mechanism like an AR15, making for much quicker, easier cleaning, and more reliable function. In the case of the SIG556, this gas piston is adjustable for two settings.

Sig Sauer 556 SWAT 10" SBR - Capitol Armory
Sig Sauer SIG556

Three high-strength carbon steel components combine to form the upper receiver. These components include a stamped sheet metal dust cover, a monoblock CNC machined from a forging, and rails CNC machined from bar stock. These components are so seamlessly CNC laser-welded together as to be imperceptible. The finish is wear-resistant Nitron. Some steel components are finished in black phosphate or black oxide.


Which is the best AR 15 rifle is very subjective depending upon your needs and budget.  Choosing your first Sig Sauer SIG556 can be tricky.  Stay tuned, because in this article we’re going to cover the best AR-15 rifles, for budget shoppers and advanced shooters alike.

After you read this guide, you will have a pretty good idea of how the AR-15 works and how different AR setups make a big difference. This should help you make an informed decision on the best AR-15 to purchase for your intended purpose.

Below, you will find our recommendations. To note, we spent days test firing these AR-15s and doing research to come up with this list.

Here’s Gun News Daily’s list of top 15 AR-15 rifles across all price points. We will go into depth on the AR-15 and each AR we suggest throughout this article, but if you want to jump right into pricing and shopping here is a quick table of our best AR picks:


  • Best AR-15 Rifles (Updated: 2023)
  • Get Great Guns and Ammo Deals!
  • Honorable Mention “Best” AR 15s
  • What is the Best AR 15 for Money?
  • Why the AR-15 is Popular?
  • AR-15 Intended Purposes – Why Do You Need an AR-15?
  • Is the AR-15 the Best Home Defense Weapon?
  • History of the AR-15
  • Should I Buy or Build an AR-15?
  • AR 15 – Barrels
  • AR-15 Gas Systems
  • AR 15 Handguards
  • How the BCG (Bolt Carrier Group) Works
  • The Best AR-15 Manufacturer List
  • AR-15 Price Points
  • Best AR-15 for the Money – Conclusion
  • Recommended Reading

Saiga .308 with some Escape from Tarkov vibes : ak47

Sig Sauer SIG556 

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