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SIG-Sauer MPX Copperhead

Pistol Caliber Carbine (PCC) / Personal Defense Weapon (PDW) [ 2022 ]

The MPX Copperhead is a SIG-Sauer entry into the popular MPX automatic weapon line.

Authored By: Staff Writer | Last Edited: 04/25/2022 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

The SIG MPX "Copperhead" is a unique AR-style, super-compact Pistol Caliber Carbine (PCC) manufactured by SIG-Sauer, part of the MPX gun line. The firearm has been purposely designed to be as lightweight and compact enough to be easily transported and deployed - notable qualities for security details, home defense, competition shooting, and general Close Quarters Battle (CQB). The Copperhead entry represents the latest entry into the MPX family lineup that includes the long-barrel "MPX PCC" and the "MPX K".

The gun's frame makes up nearly all of the length of the compact weapon, housing all of the pertinent internal working components within. Its arrangement is still traditional, with the underslung pistol grip/trigger unit at the lower aft-end of the gun. There is a two-position safety lever near the ergonomic grip and the magazine well is found just ahead of the trigger. Over the frame is a section of M1913 rail suitable for mounting various tactical accessories including laser aimers and magnifiers. The PCB (pivoting brace) support is collapsible by way of channels embedded along the sides of the upper portion of the frame. Only the muzzle protrudes from the front of the frame and no handguard is featured in an effort to keep the weapon's overall length as short as possible. The receiver is divided into a lower and upper half allowing for clear access to the internals when the gun is taken down. The charging handle is of the AR-style "pull-back" type and it can be found at the rear of the upper receiver.

Currently (2022), there are several variants of the Copperhead marketed, each chambered in 9mm Luger and relying on a gas piston / semi-automatic system of operation but differing in overall weights, barrel lengths (3.5" or 4.5"), trigger types, magazine counts (10- or 20-round), and receiver finishes.©MilitaryFactory.com
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Service Year

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United States


Pistol Caliber Carbine (PCC) / Personal Defense Weapon (PDW)

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(OPERATORS list includes past, present, and future operators when applicable)
Automatic Function
Features a mechanical function to automate the firing action.
Special Forces
Qualities of this weapon have shown its value to Special Forces elements requiring a versatile, reliable solution for the rigors of special assignments.
Special Purpose
Special purpose weapon for a specially defined battlefield role.

Compact nature allows for relatively easy concealment.
Despite its size / weight, the product can be transported by foot infantry.
Internal action allows release of single round per trigger pull, actuating a semi-automatic loading mechanism for successive shots.
An automatic, or pseudo-automatic, function is built into the system, allowing for repeat firing to be achieved.
Supports mounting of optics (scopes) to aid in accuracy for ranged fire.
Design allows for user adjustability of certain components for customization.
Design offers mounting points for external, after-market hardware including laser aimers, flashlights, scopes, and grips.

Overall Length
368 mm
14.49 in
Barrel Length
89 mm
3.50 in
Empty Wgt
4.41 lb
2.00 kg

Supported Over-Receiver Optics, Aimers, and Magnifiers.


Gas-Operated; Gas Piston; Semi-Automatic Only.

One shot per trigger pull; self-loading or auto-loading action aided by internal mechanism; trigger management (and initial cocking) typically required by the operator; subsequent shots are aided by the unlocked / moved bolt.
Gas-operated system is featured, typically involving a gas cylinder and rear-driven piston directing energy to the bolt component.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


9mm Luger

Rounds / Feed

10- or 20-round detachable box magazine (model dependent).
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
MPX Copperhead - Base Series Name.
PMPX-3B-CH-CO - 3.5" barrel; 14.5" overall length; single-stage polished / hard-coat trigger; Cerakote receiver finish.
PMPX-3B-CH - 3.5" barrel; 14,5" overall length; single-stage polished / hard-coat trigger; Cerakote receiver finish.
PMPX-4B-CH - 4.5" barrel; 15.5" overall length; TIMNEY single-stage trigger; Black Anodized receiver finish.

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Images Gallery

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Image of the SIG-Sauer MPX Copperhead
Image from official SIG-Sauer marketing materials.

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