Caliber 9mm Luger
Action Semi-Auto
Mags Included (1) 20 Rd Polymer Mag
Mag Type MPX
Twist Rate 1:10
Operating System Gas Piston
Grip Type Polymer
Receiver Finish Cerakote
Barrel Material Carbon Steel
Stock Type PCB
Forend Type Alloy
Accessory Rail M1913
Trigger Type Single Stage Polished/Hard-Coat
Barrel Length, in 3.5″
Overall Length, in 14.5″
Overall Width, in 2.4″
Height, in 8″
Weight, lbs 4.5



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Buy SIG MPX COPPERHEAD Online. The Copperhead is an overall attractive-looking gun minus the pistol grip which is a practical size but just looks a little small on the larger Sig MPX receivers. The vent cuts on the front of the handguard and the built-in handstop look natural on the short gun.

The largest and most out-of-place feature is the mag well. But it does help with reloads and doesn’t affect the overall size of the gun when it comes to covert storage.

This is a very short gun that was originally proportioned around an 8-inch barrel, so the visuals are a bit off. But it’s a PDW, not a medium-sized sub-gun like the regular MPX or an HK MP5.

SIG’s MPX Copperhead with its unmatched design and outstanding performance and familiar AR handling. Trusted by professionals, the all-new Copperhead offers a new level of operator safety and infield adaptability. Proven relentless reliability in some of the harshest environments. Perfect for either left or right-handed shooters, due to its ambidextrous controls. This MPX operates from a fully-closed and locked rotating bolt, offering enhanced reliability. All Copperhead 9mm pistols come standard with a coyote tan Pivoting Contour Brace. Then finished off nicely in E190 Cerakote for extra finish durability

Unconventional design, unmatched performance, and familiar AR handling. 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. Completely ambidextrous, the SIG MPX is great for left- or right-handed shooters with its dual-sided selector switch, magazine release, charging handle, and bolt release. The SIG MPX operates from a fully-closed and locked rotating bolt, offering enhanced reliability and safety in use. A short-stroke gas piston allows the SIG MPX to run all weights and brands of 9mm ammunition with no adjustments to the gas valve.

The SIG Copperhead is a unique weapon in many ways, as is the entire MPX line. However, it does share a ton of features with the AR-15. Specifically, how the controls are laid out.

The safety, charging handle, magazine release, and bolt release are all from the AR-15. If you’ve trained with a AR-15 you’ll have no problems translating those skills over to the SIG Copperhead. The controls are all ambidextrous as well. Simple and familiar controls
A lot of things set the MPX apart, but the main thing is the operating system.

Most PCCs run on a blowback system. The MCX runs on a short-stroke gas system with a rotary bolt. This results in a lighter recoiling gun overall.

The gun also comes with one 20 round magazine that’s made by Lancer and is mostly polymer with metal feed lips. The magazine is very similar to the Lancer AR mags.


SIG MPX COPPERHEAD For Sale . The gun also does not come with sights of any kind. It does have a full-length scope rail across the top of the upper receiver for adding a red dot .I added a Burris Fastfire 3, which is a mini red dot that seems appropriate for such a small gun.They are extremely well made, but you are looking at spending in excess of 50 dollars per magazine. To me, that’s just way too high.

Unfortunately, the aftermarket hasn’t picked up the MPX just yet, and I hope in the future we’ll send 3rd party companies producing more affordable magazines. The 20 round magazine actually looks very normal in the gun. The 30 rounders look disproportionate. It’s really adorable, to be honest. The magazines are easy to load though, and they never feel stiff or a pain to load in any way. The good news is this gun is compatible with all MPX barrels. Changing the barrels on these guns is actually pretty easy to do and barrels come in 4, 6, and 8-inch variants.

The brace comes together to conceal the strap which is another space-saving feature. It prevents anything from getting caught and hung if stored in a bag.

Extending the brace from the gun is easy, but the brace is stiff enough that it will never accidentally extend when being stored or carried Controls Left
Ambi Controls are really nice!
To collapse the brace you have a small button on the wide that is a bit of hassle, but there is a point to this. That button is small because it doesn’t need to be large.

Why would you be in a hurry to extend your brace?

Range Time
I was superbly excited to get this gun out to the range. My load of choice was Remington LE and Military Training rounds. It’s a load my local gun store had superbly cheap, especially for brass case ammo. It’s 115-grain 9mm, which should give me decent velocity even from a 3.5-inch barrel.


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