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SIG556xi®

A legend reborn. Modularity redefined.

One of the world’s most storied platforms has been rewritten. Combining the best of the AR and AK with the legendary reliability of the Swiss 550 Series, the SIG556xi® is the most adaptive tactical carbine ever. A serialized upper enables in-field adjustment of nearly every component. Introducing Generation xi.

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Change Magazine Types

Accepts AK (with AK-style lower), AR-pattern 7.62x39mm or AR-15/M16 STANAG magazines.

Gas Piston Operating System

Three-position adjustable gas piston operating system with rotating bolt.

Serialized Upper

A unique serialized upper allows you to swap lower receivers for maximum component flexibility.

Adjustable Barrel Length

Easily adapt to your environment with 10", 14.5" or 16" barrel lengths.

Multiple Lower Styles

Configure with AR* or AK-style lowers.

*Backwards compatible with SIG556 models.

Multiple Handguards

Select from aluminum, carbon fiber or polymer handguards.

Stock Options

Choose from AR-style, M1913 mount or Swiss side-folding* stocks.

*Backwards compatible with SIG556® models.

Rail Adaptable Handguards

Aluminum and carbon fiber handguards are rail adaptable allowing you to add any M1913 compatible accessories. Polymer handguards are compatible with Magpul® MOE® light and rail kits.

Sling Attachment Points

A reversable single point sling swivel keeps the SIG556xi always in reach.

Segmented Vertical Forend Grip

Go from a full-length to a “stubby" grip with this 3-piece forend grip made of durable polymer. Also features a water-tight storage compartment.

Advanced

The Next Evolution of an Icon.

Adapt this legendary system to your own needs. The SIG556xi accepts multiple calibers and magazine types, while offering ambidextrous controls and the next-generation, three-position adjustable gas piston operating system.

Change Magazine Types

Accepts AK (with AK-style lower), AR-pattern 7.62x39mm or AR-15/M16 STANAG magazines.

Gas Piston Operating System

Three-position adjustable gas piston operating system with rotating bolt.

Serialized Upper

A unique serialized upper allows you to swap lower receivers for maximum component flexibility.

Additional Features

Convert to 5.56 NATO, 7.62x39mm or 300 BLK

Ambi Controls

Configure

Part Rifle. Part Armory.

Change is the only constant. Equip the SIG556xi for any environment or mission by adjusting barrel length, lowers, stocks, handguards and more. It’s a new standard in modularity.

Adjustable Barrel Length

Easily adapt to your environment with 10", 14.5" or 16" barrel lengths.

Multiple Lower Styles

Configure with AR* or AK-style lowers.

*Backwards compatible with SIG556 models.

Multiple Handguards

Select from aluminum, carbon fiber or polymer handguards.

Stock Options

Choose from AR-style, M1913 mount or Swiss side-folding* stocks.

*Backwards compatible with SIG556 models.

Optional Features

*Backwards compatible with SIG556 models.

Removable Cheek Riser*

Original SIG556® or New SIG556xi Grips*

Accessorize

Complete the Transformation.

Just when you thought the SIG556xi couldn’t be any more versatile, it adapts yet again. Outfit your SIG556xi with a full line of accessories to take its modularity even farther.

Rail Adaptable Handguards

Aluminum and carbon fiber handguards are rail adaptable, allowing you to add any M1913 compatible accessories. Polymer handguards are compatible with Magpul® MOE® light and rail kits.

Sling Attachment Points

A reversible single point sling swivel keeps the SIG556xi always in reach.

Segmented Vertical Forend Grip

Go from a full-length to a “stubby" grip with this 3-piece forend grip made of durable polymer. Also features a water-tight storage compartment.

AccessoriesSee All

*Backwards compatible with SIG556 models.

Conversion Kits for 5.56 NATO, 7.62x39mm or 300 BLK

AR, AK or Swiss-style* Lowers

Nylon Adjustable 2-Point Sling with HK Hooks

36" Standard Rifle Bag

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Components

The Ultimate Freedom and Modularity.

Removable Cheek Riser

Swiss-Style Folding Stock

Side-Folding Stock

AR-style Stock

10" Barrel

14.5" Barrel

16" Barrel

Upper

AR Lower

AK Lower

Polymer Handguard

Aluminum Handguard

Carbon Fiber Handguard

SIG Grip

556 Grip

AR Magazine

762x39 AR Magazine

AK Magazine

Specifications

Specs SIG556xi SIG556xi Carbon SIG556xi Russian SIG556xi with SB15
Caliber 5.56 NATO / 7.62 x 39mm / 300 BLK 5.56 NATO / 7.62 x 39mm / 300 BLK 7.62 x 39mm 5.56 NATO / 7.62 x 39mm / 300 BLK
Operating System Semi-Auto Semi-Auto Semi-Auto Semi-Auto
Action Type Gas Piston, Rotating Bolt Gas Piston, Rotating Bolt Gas Piston, Rotating Bolt Gas Piston, Rotating Bolt
Overall Length 912.9 mm / 35.8" 904.2 mm / 35.6" 912.9 mm / 35.8" 716.3 mm / 28.2"
Overall Height 673.1 mm / 26.4" 673.1 mm / 26.4" 673.1 mm / 26.4" 673.1 mm / 26.4"
Rifling Type 178 mm / 1:7 178 mm / 1:7 241 mm / 1:9.5 178 mm / 1:7
Barrel Length 406.4 mm / 16.0" 406.4 mm / 16.0" 406.4 mm / 16.0" 254 mm / 10.0"
Stock Type Side-Folding Swiss Style Side-Folding SIG MPX Side-Folding Swiss Style N/A
Weight with Magazine 3.22 kg / 7.1 lb 3.18 kg / 7.0 lb 3.22 kg / 7.1 lb 3.12 kg / 7.0 lb
Handgun Material Polymer/Alloy Carbon Fiber Polymer/Alloy Polymer/Alloy
Slide Finish N/A N/A N/A N/A
Frame Material N/A N/A N/A N/A
Mag Capacity 30 30 30 30
Trigger Type 2 Stage 2 Stage 2 Stage 2 Stage
Trigger Pull 3.22 kg / 7.1 lb 3.18 kg / 7.0 lb 3.22 kg / 7.1 lb 2.86 kg / 6.3 lb
Grips Ergonomic xi w/ storage Ergonomic xi w/ storage Ergonomic xi w/ storage Ergonomic xi w/ storage
Specs
Caliber
Operating System
Action Type
Overall Length
Overall Height
Rifling Type
Barrel Length
Stock Type
Weight with Magazine
Handgun Material
Slide Finish
Frame Material
Magazine Capacity
Trigger Type
Trigger Pull
Grips
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P320

Reinventing the standard.

Introducing the P320™, a pistol that defies comparison with revolutionary features that stand alone. A smooth, consistent trigger pull. Safe, tool-free disassembly. A proper fit for any hand size—no backstrap required. Consider the mold broken.

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Serialized, Stainless Steel Frame

The P320 slide rides on all-metal rails in a solid stainless steel frame for greater stability. The serialized unit lets you change everything from size to caliber to grip at will.

Exceptional Trigger

A smooth, crisp trigger pull and short tactile reset deliver heightened accuracy.

3-Point Takedown Safety System

  1. Must remove magazine.
  2. Must lock slide to rear.
  3. Rotate takedown lever for disassembly without tools or trigger manipulation.

Disconnect Safety

Prevents the pistol from firing out of battery.

Striker Safety

Prevents the striker from releasing unless the trigger is pulled.

Convertible Calibers

Convert to 9mm, .357SIG, .40S&W or .45ACP (coming soon).

Multiple Pistol Sizes

Slide assemblies and grip modules are available in full-size, carry and subcompact (coming soon).

Interchangeable Grip Modules

Small, medium or large modules provide optimal grip circumference and access to controls for any hand size.

Integrated M1913 Accessory Rail

True Mil-std. M1913 rail ensures stability and peak performance with lights, lasers and other accessories.

Revolutionary

Innovative To Its Core.

This is a gun. A gun that could only come from SIG. The P320 elevates the standard for a striker-fired pistol with an exceptional trigger and a design as dependable as it is one-of-a-kind.

Serialized, Stainless Steel Frame

The P320 slide rides on all-metal rails in a solid stainless steel frame for greater stability. The serialized unit lets you change everything from size to caliber to grip at will.

Exceptional Trigger

A smooth, crisp trigger pull and short tactile reset deliver heightened accuracy.

Additional Features

SIGLITE® Night Sights or Contrast Sights Available

Striker-Fired Operating System

Safety

Safety Without Compromise.

Safety isn’t negotiable. The P320 maximizes peace of mind with a robust safety system. Never again will you need to pull the trigger to disassemble your pistol. And, while available as an option, you won’t need a tabbed trigger safety for your gun to be drop safe.

3-Point Takedown Safety System

  1. Must remove magazine.
  2. Must lock slide to rear.
  3. Rotate takedown lever for disassembly without tools or trigger manipulation.

Disconnect Safety

Prevents the pistol from firing out of battery.

Striker Safety

Prevents the striker from releasing unless the trigger is pulled.

Optional Features

Tabbed Trigger Safety

Magazine Disconnect Safety

Flexible

The Most Adaptable Pistol Ever.

No two hands—or scenarios—are quite the same. The P320 can be customized to meet the exact needs of the user. No backstraps required, no excuses accepted.

Convertible Calibers

Convert to 9mm, .357SIG, .40S&W or .45ACP (coming soon).

Multiple Pistol Sizes

Slide assemblies and grip modules are available in full-size, carry and subcompact (coming soon).

Interchangeable Grip Modules

Small, medium or large modules provide optimal grip circumference and access to controls for any hand size.

Integrated M1913 Accessory Rail

True Mil-std. 1913 rail ensures stability and peak performance with lights, lasers and other accessories.

AccessoriesSee All

Thread-On Silencer

Level 1 Friction Fit Paddle Holster

STL-900 Light/Laser

Range Bag

Grip Modules

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Components

Freedom to Change Calibers, Size and Fit.

Serialized, Stainless Steel Frame

Tabbed Safety Trigger

Standard Trigger

Full-size Threaded Barrel

Full-size Standard Barrel

Carry Threaded Barrel

Carry Standard Barrel

Subcompact Threaded Barrel

Subcompact Standard Barrel

Full-size Slide Assembly

Carry Slide Assembly

Subcompact Slide Assembly

Full-size Magazines

Carry Magazines

Subcompact Magazines

Full-size Grip Module

Carry Grip Module

Subcompact Grip Module

Specifications

Specs Full-Size Carry Subcompact (Coming Soon)
Caliber 9mm / .357SIG / .40S&W (.45 Coming Soon) 9mm / .357SIG / .40S&W (.45 Coming Soon) 9mm / .357SIG / .40S&W (.45 Coming Soon)
Overall Length 203 mm / 8.0" 183 mm / 7.2" 170 mm / 6.7"
Overall Height 140 mm / 5.5" 135 mm / 5.3" 119 mm / 4.7"
Barrel Length 119 mm / 4.7" 99 mm / 3.9" 91 mm / 3.6"
Sight Radius 168 mm / 6.6" 147 mm / 5.8" 140 mm / 5.5"
Sights SIGLITE® Night Sights or Contrast Sights SIGLITE® Night Sights or Contrast Sights SIGLITE® Night Sights or Contrast Sights
Weight with Magazine 833 g / 29.4 oz 737 g / 26.0 oz 706 g / 24.9 oz
Slide Material Stainless Steel Stainless Steel Stainless Steel
Slide Finish Nitron® Nitron® Nitron®
Frame Material Stainless Steel Stainless Steel Stainless Steel
Magazine Capacity 17/14/14 15/13/13 12/10/10
Trigger Double-Action Striker Double-Action Striker Double-Action Striker
Trigger Pull 24.5 – 33.4 N / 5.5 – 7.5 lb 24.5 – 33.4 N / 5.5 – 7.5 lb 24.5 – 33.4 N / 5.5 – 7.5 lb
Grips Polymer Grip Module Polymer Grip Module Polymer Grip Module
Specs
Caliber
Overall Length
Overall Height
Barrel Length
Sight Radius
Sights
Weight with Magazine
Slide Material
Slide Finish
Frame Material
Magazine Capacity
Trigger
Trigger Pull
Grips
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SIG MPX

A New Standard Has Been Set.

Unconventional design. Unmatched performance. The SIG MPX™ redefines the submachine gun category with a new level of operator safety, in-field adaptability and proven reliability in the harshest environments. There’s nothing else like it. And it’s only available from SIG.

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Rotating Bolt System

A fully locked and closed rotating bolt system provides maximum safety in case of bullet or water obstruction in the bore.

Short-Stroke Piston System

Reduce recoil and fouling with the gas-operated, short-stroke piston system. The bolt is held open on the last round fired.

AR-Style, Ambidextrous Control

No retraining required. The SIG MPX features a familiar, AR-style ambidextrous selector and magazine release.

Monolithic Upper Receiver

The monolithic upper receiver features an integral M1913 rail at 12 o'clock and a free-float barrel system.

Adjustable Barrel Length

Easily adapt to your environment with 4.5", 6.5" or 8" barrel lengths.

Stock Options

Maximize performance while conserving space with telescoping or folding stocks. Pistol configuration also available for the ultimate in compactness.

Rail-Adaptable Handguards

Choose from rail-adaptable aluminum or carbon fiber handguards.

Thread-On SIG-SD Silencer

Maintain your cover with the ability to add a thread-on silencer.

SIGTAC SBX Stabilizing Brace

Improve the single-handed shooting performance of your SIG MPX.

Rear Charging Handle

Does not interfere with rail-mounted accessories.

Reliable

Ready to Serve.

Every aspect of the SIG MPX firing system has been rigorously designed and tested. So in the heat of the moment, you can respond confidently and effectively, even under adverse conditions.

Rotating Bolt System

A fully locked and closed rotating bolt system provides maximum safety in case of bullet or water obstruction in the bore.

Short-Stroke Piston System

Reduce recoil and fouling with the gas-operated, short-stroke piston system.

AR-Style, Ambidextrous Controls

No retraining required. The SIG MPX features familiar, AR-style controls, ambidextrous selector, bolt release and magazine release.

Additional Features

Bolt Held Open on Last Round Fired

Flared and Beveled Magwell for Easy Reloading

Ambi Bolt Release

Adaptive

Adapt and Overcome.

The SIG MPX gives users the freedom to change barrel length, caliber and stock configuration, all while in the field. There’s no challenge too big or too small for this highly versatile firearm.

Monolithic Upper Receiver

The monolithic upper receiver features an integral M1913 rail at 12 o’clock and a free-float barrel system.

Adjustable Barrel Length

Easily adapt to your environment with 4.5", 6.5" or 8" barrel lengths.

Stock Options

Maximize performance while conserving space with telescoping or folding stocks. Pistol configuration also available for the ultimate in compactness.

Rail-Adaptable Handguards

Choose from rail-adaptable aluminum or carbon fiber handguards.

Optional Features

Convert to 9mm, .357SIG or .40S&W

10-, 20- or 30-Round Magazines

Integral QD Sling Point

Customize

Take it to the Next Level.

With the SIG MPX, we set out to reinvent the standard. Use our full line of accessories to assemble a full weapons system that’s yours alone.

Thread-On SIG-SD Silencer

Maintain your cover with the ability to add a thread-on silencer.

SIGTac SBX Stabilizing Brace

Improve the single-handed shooting performance of your SIG MPX.

Rear Charging Handle

Does not interfere with rail-mounted accessories.

AccessoriesSee All

Conversion Kits for 9mm, .357SIG or .40S&W

SIG MPX Folding Stock

10-, 20- or 30-Round Lancer® Magazines

Segmented Vertical Forend Grip

Triple Mag Pouch & Single Mag Carrier

LE Carry Bag

SIG MPX Deployment Bag

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Components

Find the Right Combination for Any Operation.

Telescoping Stock

Side-Folding Stock

SBX Stabilizing Brace

Upper

Lower

Aluminum Handguard

Carbon Fiber Handguard

10/20 rd Magazine

30 rd Magazine

8" Barrel

6.5" Barrel

4.5" Barrel

Specifications

Specs SIG MPX SIG MPX-K SIG MPX-P SIG MPX-SD SIG MPX-PSB
Caliber 9mm / .357SIG / .40S&W 9mm / .357SIG / .40S&W 9mm / .357SIG / .40S&W 9mm / .357SIG / .40S&W 9mm / .357SIG / .40S&W
Action Type Full/Semi-Auto Full/Semi-Auto Semi-Auto Full/Semi-Auto Semi-Auto
Operating System Closed, fully locked short stroke pushrod gas system Closed, fully locked short stroke pushrod gas system Closed, fully locked short stroke pushrod gas system Closed, fully locked short stroke pushrod gas system Closed, fully locked short stroke pushrod gas system
Stock Type Collapsible or folding Collapsible or folding None Collapsible or folding No Stock, Supporting Brace on folding knuckle
Forend Types Aluminum mono rail Aluminum mono rail Aluminum mono rail Aluminum mono rail Aluminum mono rail
Weight w/o Magazine 3.0 kg / 6.5 lbs 2.8 kg / 6.2 lbs 2.3 kg / 5.0 lbs 3.2 kg / 7.0 lbs 2.8 kg / 6.1 lbs
Overall Length 580 mm / 22.8 in 528 mm / 20.8 in 428 mm / 16.85 in (No Stock) 808 mm / 31.8 in 670 mm / 26.37 in (No Stock)
Folded Length (Folding) 610 mm / 24.0 in 559 mm / 22.0 in 838 mm / 33.0 in 462 mm / 18.18 in
Folded Length (Collapsible) 460 mm / 18.1 in 409 mm / 16.1 in 688 mm / 28.1 in
Folding Length 425 mm / 16.7 in 347 mm / 14.7 in 653 mm / 25.7 in
Rifling 1:254 mm / 1:10 in 1:254 mm / 1:10 in 1:254 mm / 1:10 in 1:254 mm / 1:10 in 1:254 mm / 1:10 in
Barrel Length 203 mm / 8.0 in 114 mm / 4.5 in 203 mm / 8.0 in 203 mm / 8.0 in 203 mm / 8.0 in
Trigger Type AR-style AR-style AR-style AR-style AR-style
Trigger Weight 3.4 kg / 7.6 lb 3.4 kg / 7.6 lb 3.4 kg / 7.6 lb 3.4 kg / 7.6 lb 3.4 kg / 7.6 lb
Mag Type Lancer polymer with steel insert Lancer polymer with steel insert Lancer polymer with steel insert Lancer polymer with steel insert Lancer polymer with steel insert
Mag Capacity 10/20/30 10/20/30 10/20/30 10/20/30 10/20/30
Specs
Caliber
Action Type
Operating System
Stock Type
Forend Types
Weight w/o Magazine
Overall Length
Folded Length (Folding)
Folded Length (Collapsible)
Folding Length
Rifling
Barrel Length
Trigger Type
Trigger Weight
Mag Type
Mag Capacity
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