SIG SAUER MCX Semi-Auto Patrol Rifle RMCX16BTFSALP — Description

The SIG SAUER MCX Patrol Rifle RMCX16BTFSALP is a modern 5.56 NATO semi-automatic rifle built on SIG Sauer’s modular MCX platform. Designed for versatility, reliability, and adaptability, the MCX Patrol combines a 16-inch barrel, folding/telescoping stock, and short-stroke gas piston operating system in a compact, rugged rifle package.

Unlike traditional direct-impingement AR-style rifles, the MCX uses a short-stroke piston system with a rotating bolt, helping reduce receiver fouling and allowing the rifle to operate without a conventional buffer tube. This design enables the use of a folding stock while maintaining a compact profile for transport and storage.

The Patrol configuration features a 16-inch cold hammer-forged barrel, black anodized finish, free-floating handguard, full-length Picatinny top rail, and a factory folding stock system. Chambered in 5.56 NATO, it accepts standard AR-pattern magazines and includes a 30-round magazine.

SIG SAUER MCX Patrol Rifle RMCX16BTFSALP — Specifications

Manufacturer: SIG SAUER
Model: MCX Patrol Rifle
Model Number: RMCX16BTFSALP
Caliber: 5.56 NATO (.223 Remington compatible)
Action: Semi-automatic
Operating System: Short-stroke gas piston with rotating bolt
Platform: SIG MCX modular rifle system

Barrel Length: 16 inches
Barrel Type: Cold hammer-forged barrel
Barrel Twist Rate: 1:7″
Receiver Material: Aluminum
Finish: Black hard-coat anodized finish
Handguard: Free-floating M-LOK-compatible handguard
Stock: Folding/telescoping stock
Magazine Type: AR-15 / STANAG compatible magazine
Magazine Capacity: 30 rounds
Trigger: SIG factory trigger system
Controls: Ambidextrous safety, magazine release, and bolt controls
Rail System: Full-length Picatinny top rail
Muzzle Thread: 1/2×28 TPI
Overall Length: Approx. 32.5–35.5 inches (stock configuration dependent)
Weight: Approx. 7.9 lbs (configuration dependent)

Key Features

• 5.56 NATO chambering
• 16-inch cold hammer-forged barrel
• Short-stroke gas piston operating system
• Closed rotating bolt design
• Folding and telescoping stock system
• No traditional buffer tube requirement
• Free-floating handguard
• Full-length optics rail
• Ambidextrous controls
• AR-pattern magazine compatibility
• 30-round magazine included
• Modular MCX barrel and caliber-change capability
• Designed for reliability in demanding environments

Package typically includes:

• SIG SAUER MCX Patrol 5.56 NATO rifle
• Folding/telescoping stock assembly
• 30-round magazine
• M-LOK handguard system
• Owner’s manual and safety documentation