Good afternoon everyone and welcome back to a another quiet Silencer Saturday afternoon. It’s quiet mostly because of our love of suppressed firearms, but it also seems like everyone has started to shelter in place due to the COVID-19 pandemic. Please take precautions to keep your yourself and your loved ones healthy and safe. Last week we discussed the Rex Silentium MG10 .308 rifle suppressor that is both affordable and quiet. This week we are going to focus on a genetic mutant of the MPX platform – the SIG Copperhead compact pistol caliber carbine. Next week I hope to bring you a review of one or two bolt action pistols from our sponsors at Yankee Hill Machine – the MARC chassis in 300BLK and .308WIN. Suppressed of course.
SILENCER SATURDAY #116: Ugly Duckling – The SIG Copperhead Suppressed
Personally, I was intrigued with the SIG Copperhead primarily because everyone else had written it off as hideous and feature lacking. For one, the Copperhead doesn’t have a swappable hand guard, making accessory real estate a premium. But most importantly, the original SIG Copperhead lacks a threaded barrel. Instead the compact platform uses an integrated flash hider that looks like the aftermath of a barrel obstruction gone wrong. I discussed my disappointment regarding the lack of threading with SIG at their 2019 Range Day Event and I walked away understanding the mindset of building the most compact pistol caliber carbine possible. But the silencer lover in me left disappointed.
I still had an infatuation with the ugly duckling and requested a Copperhead for review, knowing that I would use it as an opportunity to explain a bit about the MPX system and some options for adding a suppressor to the SIG Copperhead. The SIG MPX micro seems to be largely out of stock at most retailers and distributors, so buying a Copperhead and converting it for suppressor use could be a good option for those of you who are not turned off by the porpoise-head look of this MPX. Like me. But how’s the performance?
Specifications and description:
The MPX Copperhead features a monolithic Elite Series Cerakote® finish upper receiver, with an integrated stock knuckle lower, and a 3.5” barrel with integrated muzzle brake. The MPX Copperhead comes equipped with the new SIG SAUER Pivoting Contour Brace (PCB) giving pistol users a brace that easily adapts to the movement of the shooter’s arm with a patented swivel operation for perfect placement, and can be rapidly deployed.
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.
- OPERATING SYSTEM: Gas Piston
- CALIBER: 9mm Luger
- OVERALL LENGTH: 14.5 in (368 mm)
- OVERALL WIDTH: 2.4 in (61 mm)
- HEIGHT: 8 in (203 mm)
- BARREL LENGTH: 3.5 in (89 mm)
- WEIGHT (OZ): 4.5 lb (2 kg)
- TWIST RATE: 1:10
- MAG TYPE: MPX
Parts and accessories in this review:
- MPX Replacement Barrel ($599) – https://www.sigsauer.com/store/sig-mpx-g2-4-barrel-9mm.html
- Note: 13.5x1mm LH Thread pitch
- Griffin Armament Three Lug Adapter ($65 @ Silencer Shop) – https://www.silencershop.com/griffin-3-lug-muzzle-devices.html
- SIG Romeo 8T Optic – https://www.sigsauer.com/store/romeo8t-1×38-mm.html
- GSL Technology Phoenix Subgun/PCC Suppressor – https://www.thefirearmblog.com/blog/2020/02/01/gsl-phoenix-best-subgun/
- Ammunition: SIG Sauer Elite VCrown JHP 147gr – https://www.sigsauer.com/store/9mm-147gr-elite-v-crown-jhp.html
TFB Copperhead Coverage
- SIG Sauer’s updated MPX Copperhead – https://www.thefirearmblog.com/blog/2019/10/17/sig-sauer-mpx-copperhead/
- MPX COPPERHEAD: New Sig MPX Ultra-Compact – https://www.thefirearmblog.com/blog/2019/01/07/copperhead/
- [SHOT 2019] Sig Sauer Range Day – Copperhead, Canebrake, Rattler – https://www.thefirearmblog.com/blog/2019/01/28/sig-sauer-range-day-copperhead/
NEWINGTON, N.H., (October 14, 2019) – SIG SAUER, Inc. is pleased to announce the ultra-compact SIG SAUER MPX Copperhead with new features, including a suppressor-ready barrel with A2 flash-hider, expanded 30-round magazine capacity, and a full-black finish is now available exclusively through the Bill Hicks distribution network.
The SIG MPX Copperhead is a sub-gun with in-field adaptability, unmatched performance, and familiar AR handling. Completely ambidextrous, the SIG MPX Copperhead is great for left- or right-handed shooters with its dual-sided selector switch, magazine release, charging handle and bolt release. The SIG MPX Copperhead 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 Copperhead to run all weights and brands of 9mm ammunition with no adjustments to the gas valve.
The MPX Copperhead features a monolithic elite Series black anodized finish upper receiver, a 3.5” threaded suppressor-ready barrel with A2 flash hider, 2-position pistol contour brace with integrated brace knuckle, PDW pistol grip, a single-stage trigger, and ships with (1) 30-round polymer magazine.
MPX Copperhead Barrel Swap:
Unlike most barrels, the Copperhead barrel has a flash hider machined into the muzzle, making attaching a suppressor problematic. One solution is to buy a new barrel and swap it out yourself, with the right tools and the owners manual, the MPX barrel can be swapped out by the end user. This is one of the aspects of the MPX/MCX platforms that really sets it apart from other PCCs.
Replacement Barrel alternative:
Of course, a $600 barrel is a tough pill to swallow on an already $1500 gun. There are competent gunsmiths like Class 3 Machining, that can add threads to your existing copperhead barrel for less than $200.
Shooting The Ugly Duckling Suppressed
Just when I thought the Copperhead couldn’t get any uglier, I had to go and swap out the barrel and add a gigantic suppressor. But looks aren’t everything – it’s what’s inside that counts the most. Or so I’ve been told. And besides, even with its flaws, I still find it oddly sexy.
In comparison to other pistol caliber carbines, the modified Copperhead just wasn’t that quiet, even with one of the world’s best silencers for the job. The heavy action made a lot of noise, the actual report was average at best and there was a good deal of blowback in the form of smoke and particulate matter.
Serves me right, I guess. The Copperhead was made to be a super compact PDW, not a huge suppressed weapon platform. Much like the Rattler, this is a tiny package. However, in comparison, the Rattler actually suppresses very well.
It’s definitely a unique and interesting gun with a quality framework. However, the MPX Copperhead is not my first choice of a suppressor host. Of course, the Bill Hicks exclusive Copperhead listed above includes a threaded barrel. That might push me over the edge. But I wouldn’t look for MP5-level quiet.
Thank you for reading yet another edition of TFB’s Silencer Saturday. Be safe, have fun and we’ll see you back here next weekend.
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