Sig Sauer MPX for sale
(0)
SIG SAUER MPX
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
9×19mm Parabellum
Capacity:
35
Finish Per Color:
Black
(3)
Sig Sauer MPX Copperhead 9mm 3.5" 1:10" Bbl Semi Pistol w/ Integrated Flash Hider, PDW Pistol Grip, & (1) 20rd Poly Mag No Brace PMPX-3B-CH-NB
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
3.5 inches
Caliber:
9×19mm Parabellum
Capacity:
20
Finish Per Color:
Tan
(1)
Sig Sauer MPX Copperhead K 9mm 4.5" Bbl Blk Pistol w/ M-LOK Handguard & (1) 20rd Poly Mag PMPX-4B-CH-NB
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
4.5 inches
Caliber:
9×19mm Parabellum
Capacity:
20
Finish Per Color:
Black
(7)
Sig Sauer MPX K 9mm 4.5" 1:10" Bbl Blk/Coy Semi Pistol w/ Al M-LOK Handguard & (1) 35rd Poly Mag No Brace PMPX-4B-9-NB
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
4.5"
Caliber:
9×19mm Parabellum
Capacity:
35
Finish Per Color:
Black
(1)
Sig Sauer MPX Copperhead 9mm AR Pistol, Coyote Tan - PMPX-3B-CH
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
3.5”
Caliber:
9×19mm Parabellum
Capacity:
20
Finish Per Color:
Coyote Tan
(20)
Sig Sauer RMPX16B9 MPX PCC 9mm Luger 16" 30+1 Black Hard Coat Anodized Black
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
16in
Caliber:
9×19mm Parabellum
Capacity:
30+1
Finish Per Color:
Black
(1)
SIG SAUER MPX COPPERHEAD
Brand:
Sig Sauer
Barrel Length:
4.5
Caliber:
9×19mm Parabellum
Capacity:
20
Finish Per Color:
Black
Rounds:
20
(0)
SIG SAUER MPX PPC TARAN TACTICAL JOHN WICK 3
Brand:
Sig Sauer
Barrel Length:
16"
Caliber:
9×19mm Parabellum
Capacity:
30
Rounds:
30
(6)
Sig Sauer MPX PCB 9mm 4.5" Pistol, Black - PMPX-4B-9
Brand:
Sig Sauer
Barrel Length:
4.5”
Caliber:
9×19mm Parabellum
Capacity:
30
Finish Per Color:
Black
(0)
Sig Sauer SIG MPX CopperHead 9mm Pistol, Black - PMPX-4B-CH
Brand:
Sig Sauer
Barrel Length:
3.5
Caliber:
9×19mm Parabellum
Capacity:
30
Finish Per Color:
Black
(0)
Sig Sauer MPX SBR Black 9mm 8-inch 30rd
Brand:
Sig Sauer
Barrel Length:
8"
Caliber:
9×19mm Parabellum
Capacity:
30
Finish Per Color:
Black
Marketplace Insights
★ 4.7/5
based on 39 customer reviews across 11 products from 26 retailers
The Sig MPX is overwhelmingly praised for its accuracy, reliability, smooth shooting, and quality construction, with only minor complaints about accessories and isolated reliability issues.
What customers like
Accuracy & Precision33%
Incredibly accurate and build quality is very impressive.
Low Recoil & Smooth Shooting31%
This is a very soft shooting pistol caliber weapon
Quality & Build Construction28%
No rough edges - If I needed to - I would trade every handgun
Reliable & No Failures23%
3000 rds and zero fails! This pistol ate up every type of ammo.
Excellent Trigger Performance21%
Stock Trigger is fantastic (no play and smooth operation)
Common concerns
Limited Included Accessories10%
does not come with any type of carrying case
Trigger/Reliability Issues5%
I have already broken 2 triggers
Magazine Compatibility Issues5%
the Gen 2 magazine won't load
Frequently Asked Questions
Sig Sauer MPX for sale
Do they still make the SIG MPX?
Yes, SIG Sauer still manufactures the MPX. Current marketplace listings show 16 active variants across 25 retailers, with 14 in stock. Prices range from $1,300 to $2,345 depending on configuration—pistol, PCC, and SBR models are all available.
How much does an MPX cost?
SIG MPX firearms typically cost between $1,300 and $2,350, with a median price around $2,000. Pistol, PCC, and SBR configurations are priced differently.
Is the SIG MPX considered a pistol?
The SIG MPX is available as both a pistol and a carbine. Pistol variants have short barrels and no stock, while carbine versions have longer barrels. Classification depends on the specific configuration. Always verify your variant's ATF classification before purchasing.
Is SIG MPX K discontinued?
No, the SIG MPX K is not discontinued. Recent updates include a PCB folding brace. Pricing ranges from $1,300 to $2,345, with a median around $2,000.
What is the difference between the MPX and MPX-K?
The MPX-K is a compact variant featuring a shorter barrel and handguard than the standard MPX. Both fire 9mm and share the same modular platform. The K prioritizes portability for concealed carry and close-quarters use, while the standard MPX provides more grip space and greater versatility.
Is the SIG MPX K reliable?
Yes, the MPX-K is generally considered reliable. Most users report consistent performance across ammunition types with minimal malfunctions. It feeds reliably and holds up well over extended use, making it a solid choice for both range shooting and defensive applications.
Is the SIG MPX discontinued?
No, the SIG MPX is not discontinued. It remains in active production with multiple configurations, including the MPX-K, available through various retailers at prices typically around $1,999.99.
What is the price of the SIG MPX Copperhead?
SIG MPX Copperhead models typically sell around $1,999.99, with listings ranging from $1,299.99 to $2,345.29. Sixteen variants from twenty-five retailers are currently in stock.
What is the difference between SIG MPX and Copperhead?
The Copperhead is a more compact, pistol-configured variant with a 3.5" barrel and monolithic upper receiver with integrated stock knuckle. The MPX K has a 4.5" barrel and a removable handguard, offering more modularity. Both use the same internals and fire 9mm.
Is the SIG MPX reliable?
The SIG MPX is generally considered reliable. Most users report consistent performance with quality ammunition. Some experience feeding issues with cheap steel-cased rounds. Its gas-piston system handles carbon buildup better than blowback designs, making it a solid choice for regular use.
Is the SIG MPX drop safe?
The SIG MPX is drop safe with the safety lever engaged. If dropped with the safety off, an unintended discharge is possible. Always carry with the safety on; the safest method is chamber empty with the safety engaged.
Does SIG MPX K require a tax stamp?
In stock form with a brace, the MPX K doesn't require a tax stamp. Adding a traditional rifle stock converts it to an SBR. As of January 1, 2026, the $200 NFA fee is eliminated, but you still must complete federal registration via an approved Form 4 before making that conversion.
What are the pros and cons of the SIG MPX?
Pros: Accurate, reliable, smooth recoil, AR-style controls, compact variants suit tight spaces. Cons: Expensive compared to other 9mm carbines, loud without a suppressor, folding brace can shift during use. A solid choice for defense or competition if the price fits your budget.
What mags does SIG MPX use?
SIG MPX uses proprietary 9mm magazines available in 10, 20, 30, 32, 35, 40, and 50-round capacities. SIG Sauer manufactures official versions; third-party brands like ProMag and THRiL also make compatible magazines. Prices range roughly $20–$80 depending on capacity and brand.
Do you need a tax stamp for a SIG MPX?
Stock MPX pistols and rifles don't require a tax stamp. The pistol variant with a brace and the 16-inch rifle are both legal without one. If you add a stock to the pistol or shorten the barrel below 16 inches, you must register it as an SBR, though as of January 1, 2026, the federal tax stamp fee is $0.
