Category: Firearms & Stocks » Semi Auto Rifles/Carbines
SIG MPX K 4.5" Folding Brace
Sig Sauer SIG MPX K 4.5" Folding Brace
Our Price: $2799.95 each
1 Available
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The MPX offers versatility through its modularity, allowing you to adapt it to fit your needs and environment.
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. A full-length picatinny rail allows for solid, consistent mounting of optics and targeting lasers. The MPX K features a 4.5" barrel and a short aluminum KeyMod handguard with handstop.
  • Short-Stroke Piston System: Reduce recoil and fouling with the gas-operated, short-stroke piston system. The bolt is held open on the last round fired.
  • Rotating Bolt System: A fully locked and closed rotating bolt system provides maximum safety in case of bullet or water obstruction in the bore.
  • AR-Style, Ambidextrous Control: No retraining required. The SIG MPX features a familiar, AR-style ambidextrous selector and magazine release.
  • Monolithic Upper Receiver: The monolithic upper receiver features an integral M1913 rail at 12 o’clock and a free-float barrel system.
  • Rear Charging Handle: Does not interfere with rail-mounted accessories.
  • New SIG PCB Folding Brace: allows the K to fold into an ultra-compact size and be operable in the folded position


Caliber: 9mm Lugar
Model: MPX K
Operating System: Gas Piston
Weight: 6.4 lb
Overall Length: 17.5in (Stock Collapsed) 22" (Stock Extended)
Overall Width: 2.4in
Mounting System: KeyMod/1913 Picatinny
Barrel Material: Carbon Steel
Barrel Length: 4.5" (114mm)
Barrel Twist: 1:10
Grip Material: Polymer
Grip Color: Black
Stock: Pistol Brace
Capacity: 5/30 (pinned to 5 rds)
Finish: Cerakote
Accessories: Manual, Lock
Color: Coyote
Item Nr.: 165-MPX-4B-9-COY
RPAL Required – Requires a valid RPAL to purchase-RESTRICTED FIREARM
Export-Restricted – Cannot ship outside of Canada.


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