MPX Copperhead with Brace Now Available
The MPX Copperhead is renowned for its ultra-compact frame and adaptability. Every aspect has been rigorously tested and its short-stroke gas piston system allows for seamless operation across all 9mm ammunition types. Now available with brace, the MPX Copperhead is the ideal package for close-quarter situations.
Featuring a monolithic Elite Series Cerakote™ finish upper receiver, the MPX Copperhead offers familiar AR controls and a completely ambidextrous design. The 9mm carbine is standard with a 3.5” barrel with integrated flash hider and come standard with a polished and hardened single stage trigger. Like its MPX brethren, the Copperhead gives owners full adjustability with the freedom to change barrel length, stock and configuration, all while in the field.
The MPX has been a leader in the PCC category for years, and the newest Copperhead model is sure to take a bite out of the competition.
Key Features:
★ Gas Piston Operating System
★ Monolithic Upper Receiver
★ Ambi Controls (Safety, Mag Release, Charging Handle, Bolt Release)
★ Fully Closed and Locked Rotating Bolt
★ 3.5-inch Barel with Integrated Flash Hider
★ Low-Profile Brace
The MPX is Also Available in These Models:
SIG MPX PCC
The MPX has been a leader in the PCC category for years, with champions like Lena Miculek running the platform for its superior performance and reliability. Now the MPX is offered in the PCC competition-ready platform that gives you the same reliability with the ultimate in performance.
SIG MPX K
The MPX K features the SIG PCB folding brace which allows the K to fold into an ultra-compact size and be operable in the folded position. The K also features an updated M-Lok handguard and is upgraded with the ultra smooth and fast Timney Trigger.
Do You Own a SIG MPX? Get 15% Off the SIG Webstore!
Register your MPX (or any SIG firearm) with us at sigsauer.com and you will receive a 15% off coupon code good for your next order at the SIG Webstore!
MPX Accessories
Choose from barrels, handguards, stocks, magazines and more.
MPX Conversion Kits
Modify the length of your MPX with these complete barrel assemblies.
MPX Handguards
Customize your MPX with handguards available in multiple lengths and colors.
MPX Magazines
Stock up on mags for your MPX. Available in 10, 20 and 35 rounds.
Braces and Stocks
Accessorize your MPX with a new brace or stock. Available in multiple styles and colors.
Purchase Small MPX Parts Quickly and Easily with Our Online Tool
Ideal for keeping backup or common maintenance parts for your MPX
Intuitively navigate multiple levels for upper or lower components. Zoom in and out to narrow your purchasing options and add to cart without leaving the shopping experience.
SIG SAUER Partner Offer
Safely order bouquets to be shipped on Valentine’s Day!

FIREARMS • AMMUNITION • ELECTRO-OPTICS • SUPPRESSORS • AIRGUNS • TRAINING
SIG SAUER Inc.,
72 Pease Boulevard, Newington, NH 03801
(603) 610-3000
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