SIG MPX Competition Carbine Rifle RMPX-16B-9-35 — Description

The SIG SAUER MPX Competition Carbine RMPX-16B-9-35 is a premium 9mm semi-automatic pistol-caliber carbine (PCC) designed for competitive shooting, training, and recreational use. Built on SIG Sauer’s modular MPX platform, the Competition Carbine combines a 16-inch barrel, lightweight aluminum M-LOK handguard, folding/collapsible stock, and a high-capacity 35-round magazine for a fast-handling and versatile carbine configuration.

Unlike traditional direct-blowback PCC designs, the MPX utilizes a short-stroke gas piston operating system with a closed, rotating bolt, providing a smooth operating cycle and reduced felt recoil. The platform features AR-style ergonomics with ambidextrous controls, making it familiar for many modern rifle users.

The Competition Carbine configuration includes a 16-inch cold hammer-forged barrel, a free-floating aluminum M-LOK handguard, folding/telescoping stock, and optics-ready receiver design. Its compact 9mm chambering and competition-focused setup make it well suited for PCC competition formats, range sessions, and users seeking a refined pistol-caliber rifle platform.

SIG MPX Competition Carbine RMPX-16B-9-35 — Specifications

Manufacturer: SIG SAUER
Model: MPX Competition Carbine
Model Number: RMPX-16B-9-35
Caliber: 9mm Luger (9×19mm)
Action: Semi-automatic
Operating System: Short-stroke gas piston with closed rotating bolt
Platform: SIG MPX modular carbine system

Barrel Length: 16 inches
Barrel Type: Cold hammer-forged barrel
Barrel Twist Rate: 1:10″
Receiver Material: Aluminum
Finish: Black hard-coat anodized finish
Handguard: Aluminum M-LOK free-floating handguard
Stock: Folding/telescoping stock
Magazine Type: SIG MPX detachable magazine
Magazine Capacity: 35 rounds
Trigger: SIG MPX factory trigger system
Controls: Fully ambidextrous controls
Charging Handle: Ambidextrous charging handle
Bolt System: Closed rotating bolt
Overall Length: Approx. 28.5–33 inches (stock collapsed/extended)
Weight: Approx. 7.2 lbs

Key Features

• 9mm pistol-caliber carbine platform
• 16-inch barrel for carbine configuration
• Short-stroke gas piston operating system
• Closed rotating bolt design
• 35-round factory magazine included
• Folding/telescoping stock
• Free-floating aluminum M-LOK handguard
• Ambidextrous safety, magazine release, charging handle, and bolt controls
• Optics-ready Picatinny top rail
• Modular MPX accessory compatibility
• Competition-oriented PCC design
• Low-recoil 9mm chambering

Package typically includes:

• SIG SAUER MPX Competition Carbine 9mm rifle
• 35-round MPX magazine
• Folding/telescoping stock assembly
• M-LOK handguard system
• Owner’s manual and safety documentation