Sig MPX Copperhead Review [2020]: Fun but worth it?

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Striking with the ferocity of its namesake, the SIG MPX Copperhead is the most compact pro-grade sub-caliber carbine available.

With its ultra-compact and lightweight design, this pit viper of a weapon is manufactured for maximum performance and minimal snag points to provide the best operator experience possible. Its unique design allows it to be one of the best of its kind for top concealment and quick, easy deployment.

But enough talk, let’s get into our SIG SAUER MPX Copperhead review!

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SIG MPX COPPERHEAD

Sold at BROWNELLS

WHAT IS THE SIG MPX COPPERHEAD

So, how did the Copperhead come to be? There are a few theories surrounding this weapon.

One is that it was custom designed from customer input looking for a lower cost version of SIG’s MPX. And a version that had more features, but didn’t lose the MPX’s closed rotating bolt design.

Another is that the Copperhead was created specifically for the US Army and its Sub Compact Weapon program. Whether that’s entirely true or not is speculation, but the Copperhead has already received numerous government contracts since its debut at the 2019 SHOT Show in Las Vegas.

SIG MPX SPECS

Host Platform

Sig

Caliber

9mm

Magazines

MPX

Weight

4.5 lbs

Capacity

20 rounds

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SIG MPX COPPERHEAD FEATURES REVIEW

sig-copperhead-dot-features
THIS IS TO TEST IF THIS WORKS
1 RAPID DEPLOY PCB BRACE

When fully extended, this brace rotates to allow the user the ability to contour with the pistol itself.

3 INTEGRATED FLASH HIDER

With the Copperhead’s integrated flash hider, the crown of the barrel is protected and the overall length is kept short.

2 20 ROUND MAGAZINE

The Copperhead’s reduced magazine only adds to its conceal ability and deployability.

4 ULTRA-SHORT INTEGRATED 3 AND 1/2 INCH BARREL

This barrel is designed for maximum deployment in all situations.

SIG MPX COPPERHEAD REVIEW - OUR TAKE

At first glance, the MPX Copperhead is a beautifully designed weapon. It really is a head turner with its sleek, yet simple profile and custom Cerakote finish. But don’t let its simplicity fool you. The Copperhead is packed full of awesome and useful features

Sig-MPX-Copperhead Gun University

SIG continues its trend of putting their customers and clients first with their MPX standard ambidextrous controls. This may seem trivial, but using controls that are natural to your body make all the difference–especially in a high-action scenario. We wish that some of these ambi-controls were on our Sig MCX Rattler (ahem…Sig).

Although the Copperhead has been swapped to a monolithic upper, that doesn’t mean that you can’t use your fair share of attachments. The Copperhead ships with a full-length Picatinny rail (as requested by the US Army) making sure that you can utilize any sights or optics devices you choose. There’s also a three slot Picatinny on the rear of the weapon allowing for the use of various sling or stock attachments. And that can definitely come in handy.

One of the nicest features to come with the Copperhead is the collapsable brace integrated into the receiver. The SIG PCB (Pivoting Contour Brace) allows the shooter to really get down on the sights and maneuver around to better target.

At first, we really weren’t sure about the pivoting brace. Up until now, pistol braces were fixed (as far as rotation goes) and we weren’t sure if the new rotating brace would be a benefit or a hinderance. According to Sig, the pivoting stock adjusts to your arm position so you can take full advantage of Sig-MPX-Copperhead-Pistol Gun Universitysights/optic on the Copperhead. Sig is right. If you’ve ever used a standard pistol brace as it was intended (most people don’t), you’ve likely noticed that the pistol is canted so much that it makes aiming awkward. Sig’s new rotating brace fixes this and allows for aiming without having to fully straighten nor lock your arm.

Sig-MPX-Copperhead-Pistol Gun University

Now, let’s talk about that barrel. The Copperhead comes standard with a 3 1/2 inch barrel. This is yet another tactic employed by SIG to maintain peak deployability. But there’s one thing about it that I’m not so keen on: the barrel’s flash-hider is permanent with no threads. That means no suppressor or barrel attachments.

This is my only real gripe with the MPX Copperhead. One of the main reasons for a sub-calibered “not-a-rifle” is to be able to shoot with a silencer. If you agree, then the standard Sig MPX might be for you. Or… you can swap the barrel with any other MPX barrel to get the threads you desire

Although I don’t like it, I do understand where Sig was going with this. The permanent flash hider cuts down on cost and weight while keeping the overall length small enough to fit into a backpack (which would not be possible with a silencer attached).

Sig-MPX-Copperhead-Flash-Hider Gun University

But how about the weapon as a whole? How does it stand up to serious use

When it boils down to it… The Copperhead proves itself more than reliable and capable. The Copperhead is a BLAST to shoot and if you’re looking for the smallest 9mm carbine that is also professional-grade, then the Sig Copperhead may be for you.

One final note, I’m a bigger guy (with an even bigger head) and the extreme small size of the Copperhead made it a little difficult to shoot well. I prefer the standard MPX, but that’s only because I’m not looking for the smallest package. If you are, the Copperhead is for you.

Sig-MPX-Copperhead Gun University

When it boils down to it… The Copperhead proves itself more than reliable and capable. The Copperhead is a BLAST to shoot and if you’re looking for the smallest 9mm carbine that is also professional-grade, then the Sig Copperhead may be for you.

One final note, I’m a bigger guy (with an even bigger head) and the extreme small size of the Copperhead made it a little difficult to shoot well. I prefer the standard MPX, but that’s only because I’m not looking for the smallest package. If you are, the Copperhead is for you.

SIG MPX COPPERHEAD REVIEW: PROS AND CONS

  • Sleek/Lightweight Carbine Design
  • Closed Rotating Bolt Design
  • Collapsable PCB
  • Rugged and Reliable
  • Price
  • Front Hand Stop Concerns
  • Barrel Doesn’t Allow Attachments

REPORT CARD

RELIABILITY

This is the most reliable 9mm carbine system

A+
ACCURACY

Accurate enough

A
CUSTOMIZATION

Not much you can change. Fixed flash hider, no mounting options

C
ERGONOMICS

Much better ergonomics than other firearms in its class but its small size makes it less ergonomic.

B+
VALUE

Great value for what you’re getting and less expensive than other MPX models

A+
sig-copperhead-review-grade

FINAL GRADE : A+

The Sig MPX Copperhead is such a fun gun and well worth getting.  If you own it already or are going too,  you’re gonna need some key essentials.

Once you’ve got the basic needs down for your MPX Copperhead, time to move on to the fun stuff. How about some upgrades?

Best Sights for the SIG MPX COPPERHEAD

Putting a top-notch red dot sight on your MPX is becoming more and more popular as time goes by. As a matter of fact, most manufacturers are releasing their newer models to be optics ready. And the cool thing is the Sig Sauer MPX comes ready, so with a little know-how, you can outfit yours with one of these cool sights.

Sig-MPX-Sight-Editors-Choice

Romeo5 Compact 2 Moa Red Sight

This is made by SIG for their firearms, and the ROMEO5 features their MOTAC (Motion Activated Illumination) and I love that this extends the life of the battery and activates when movement begins. The ROMEO5 mounts on any platform and is highly durable. CHECK AMAZON PRICE

This company is not as known or popular as other brands, however it is a very good red system.  I like that it uses both a solar cell and high capacity battery to power the optic, making sure I always have a reliable point of aim in the field. Thats a big deal for me!  CHECK AMAZON PRICE

SIg-MPX-Copperhead Sight

Other Sub Gun in its Class to Check Out

The subgun is an interesting category  in firearms.  Its not really a pistol and not really a rifle, but something in between.  Is this an important category to have?  In my opinion, it is absolutely vital to have these types of firearms.  Check below on a review we did in the same category that explains more and, it’s also a very good subgun!

lux defense MP17 Gun University

PDWs are super popular now. It seems like the industry is flooded with 9mm carbines. And why not? They’re a ton of fun to shoot, low recoil, compact/concealable, and they shoot inexpensive ammo. READ MORE HERE

How To Care For Your SIG SAUER MPX COPPERHEAD

To keep your firearm lasting and fully functioning,  keep it clean and maintain it.  The Sig MPX Copperhead is an outstanding firearm, so it’s important to take care of itl. To help you do this, here is a video on breaking it down.

 

If you’d like to get started cleaning your gun, here is our recommended cleaning kit for the SIg MPX Copperhead:

There is plenty out there on getting “snake bitten” by the MPX COPPERHEAD and we have put a few keys things below to make sure you aware of with this firearm.

Rate

Average rating 4.5 / 5. Vote count: 2

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