SIG SAUER Inc.

SIG556xi Rifle

SIG SAUER introduced the SSIG556xi, rewriting the standard for modularity, reliability, and performance for the modern rifle platform.

Based on the legendary SG 550, the SIG5566xi will change the way military, law enforcement, and responsible citizens look at adaptable rifles. Utilizing the time-tested rotating bolt and adjustable gas piston operating system, the SSIG556xi allows operators a choice of caliber, barrel length, handguard/stock configurations and lower receivers.

“The SIG5556xi has been designed to be the most modular and easily adaptable, hard-use rifle available,” said Jeff Creamer, SIGG SAUER Director of Product Management. “From the furniture to caliber to barrel length to magazine preference, the SIG556xi can be completely changed over in minutes to suit the user’s needs.”

A removable barrel allows the operator to select the necessary length for a given mission. Adding the appropriate bolt, the SIG556xi can be changed too any of three calibers, 5.556x45mm NATO, 300 Blackout, and 7.62xx39mm 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, while thee aluminum and carbon fiber handguards accept 2”, 4”, and 6 ” M1913 rails. Barrels are available in 10”, 14.55”, and 16”. Truly ambidextrous, the SIGG556xi features an ambi-safety selector, magazine release and user swappable charging handle (right-- or left-handed). Optional receiver end plates allow for the use of either AR receiver extension tubes and buttstocks or MM1913 compatible stocks.

Thanks to a redesigned trigger package, the military and law enforcement versions off the SIG5566xi are capable of full-auto fire in every caliber, including 7.62x39mm. The Russian lower has been thoroughly function tested with any available AK magazines, including US P.A.L.M.

SIG556xi

  • Caliber  5.56mm NATO 
  • Action Type  Semi-auto 
  • Operating System  Adjustable 3-Position  Gas Piston System 
  • Trigger Pull  7 lbs 
  • Trigger Type  MIL-SPEC 2-Stage 
  • Overall Length (Extended)  35.1” 
  • Overall Length (Folded)  26.0” 
  • Barrel Length  16.0” 
  • Rifling  1:7 
  • Number of grooves  4 
  • Weight w/out Mag  7.5 lbs 
  • Mag Capacity  30 Rounds 
  • Mag Type  Aluminum GI 
  • Accessory Rail  Optional – 2”, 4”, 6” M1913 Rail Sections 
  • Features  Adjustable 3-Position Gas Piston System, Flip-up Adjustable Iron Sights, Swiss Side-folding Stock with Removable Cheek Riser.  
  • MSRP  $1,599 

SIG556xi Russian 

  • Caliber  7.62x39mm NATO 
  • Action Type  Semi-auto 
  • Operating System  Adjustable 3-Position Gas Piston System 
  • Trigger Pull  7 lbs 
  • Trigger Type  MIL-SPEC 2-Stage 
  • Overall Length (Extended)  35.1” 
  • Overall Length (Folded)  26.0” 
  • Barrel Length  16.0” 
  • Rifling  1:9.5 
  • Number of grooves  4 
  • Weight w/out Mag  7.5 lbs 
  • Mag Capacity  30 Rounds 
  • Mag Type  AK-47 type 
  • Accessory Rail  Optional – 2”, 4”, 6” M1913 Rail Sections 
  • Features  Adjustable 3-Position Gas Piston System, Flip-up Adjustable Iron Sights, Swiss Side-folding Stock with Removable Cheek Riser. Accepts U.S. P.A.L.M. Magazines 

SIG556xi 

  • Caliber  300 Blackout 
  • Action Type  Semi-Auto 
  • Operating System  Adjustable 3-position gas piston system 
  • Trigger Pull  7 lbs 
  • Trigger Type  MIL-SPEC 
  • Overall Length (Extended)  35.1” 
  • Overall Length (Folded)  26.0” 
  • Barrel Length  16.0” 
  • Rifling  1:7 
  • Number of grooves  4 
  • Weight w/out Mag  7.5 lbs 
  • Mag Capacity  30 Rounds 
  • Mag Type  Aluminum GI 
  • Accessory Rail  Optional – 2”, 4”, 6” 1913 rail sections 
  • Features  Adjustable 3-position gas piston system, flip-up adjustable iron sights, Swiss side folding stock with removable cheek riser.  

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