SIG Sauer MPX K 9mm Pistol, 4.5-inch Barrel, Short-Stroke Gas Piston, Ambidextrous Controls, Radian Raptor-LT, 4x 30-Round Magazines
This SIG Sauer MPX K brings the compact 4.5-inch barrel configuration together with the MPX's short-stroke gas piston system and rotating-bolt lockup. It features ambidextrous controls, a dual-rod telescoping brace, and flip-up iron sights. Thoughtful upgrades include a Radian Raptor-LT ambidextrous charging handle and added short Picatinny rail sections at 9 and 6 o'clock, with the factory charging handle also provided.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm is in great shape overall. Minor scratches and blemishes are present, including visible scratches on the top rail.
What’s Included
- 4x 30-round magazines (total of four; the magazine shown inserted in some photos is included in this count)
- Black sling
- Radian Raptor-LT ambidextrous charging handle for SIG MPX (installed)
- SIG Sauer factory MPX charging handle (OEM), provided and stored in the Radian package
- SIG MPX manual
- SIG Sauer factory cardboard box
The MPX K variant pairs a 4.5-inch steel barrel with a short aluminum handguard, delivering a compact footprint without giving up the MPX's well-known short-stroke gas piston operation and rotating-bolt lockup. The barrel is threaded and fitted with SIG's closed-end, tri-port flash hider (installed). Note: If any gallery image appears to show a bare/thread-protected muzzle, it was photographed without the device or at an angle that obscures the ports; the pistol ships with the flash hider installed.
Controls are fully ambidextrous for safety and magazine release, with a left-side bolt catch for efficient manipulation. A Radian Raptor-LT ambidextrous charging handle is installed, and the OEM SIG factory charging handle is included in the package. The receiver is aluminum with a full-length 1913 Picatinny top rail and clear factory markings.
The free-float aluminum M-LOK-style handguard is complemented by short Picatinny accessory rail sections at 9 and 6 o'clock for mounting mission-critical add-ons as you prefer. The pistol ships with flip-up front and rear iron sights.
A dual-rod telescoping brace with an SB-style cuff enhances control while maintaining the K model's compact form. The platform uses proprietary MPX double-column polymer magazines, and capacity is noted at 30+1. Receiver markings include SIG SAUER, INC NEWINGTON NH USA and SIG MPX MULTI-CAL.