Description
The SIG MPX K is a compact, gas-operated pistol-caliber carbine from SIG Sauer, engineered for superior performance. It features a monolithic upper receiver machined from 7075-T6 aluminum with a hard-coat anodized finish for extreme durability. This 9mm platform is renowned for its short-stroke piston system, minimizing recoil and heat transfer to the bolt carrier group. Its modular design offers extensive compatibility with aftermarket MPX triggers, handguards, and braces.
Key Features
- Short-stroke gas piston system for reliable, clean operation
- 4.5-inch cold hammer-forged barrel with 1/2×28 TPI threads
- Monolithic 7075-T6 aluminum upper receiver for zero flex
- Non-reciprocating, ambidextrous charging handle
- Accepts standard AR-style fire control groups and pistol grips
Specifications
| Caliber / Type | 9mm Parabellum / Pistol-Caliber Carbine |
|---|---|
| Material | 7075-T6 Aluminum Upper, Steel Barrel & Bolt |
| Finish | Hard-Coat Anodized (Black) |
| Compatibility | SIG MPX Gen 2 & 3 platforms, many AR-style parts |
| Weight | Approx. 4.5 lbs (unloaded) |
The SIG MPX K’s short-stroke piston is the core of its reliability, cycling 9mm NATO-spec ammunition without direct gas impingement on the bolt. This design keeps the action cleaner and cooler than direct blowback systems, enhancing component life. The 4.5-inch barrel provides optimal velocity for 9mm defensive loads, making it a top choice for close-quarters use, competition, or as a truck firearm where compact size and immediate reliability are critical.
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