Sig Sauer MCX Patrol 5.56 NATO 16-Inch Piston Rifle – First-Gen KeyMod, Upgraded Binary Trigger, Ambi Controls
This Sig Sauer MCX Patrol is a first-generation configuration with a free-float aluminum KeyMod handguard and a continuous top Picatinny rail. It runs a semi-automatic, short-stroke gas piston system with a 16-inch threaded barrel capped by a three-prong flash hider. This rifle is upgraded with a binary trigger featuring a 3-position SAFE/SEMI/BINARY selector. It includes ambidextrous controls, a SIG M-MBP telescoping carbine stock with a QD socket, a FAB Defense AG-43 tan pistol grip, and a Mission First Tactical React Folding vertical foregrip. Two 30-round magazines are included: one MFT polymer magazine and one Magpul PMAG GEN M3 windowed magazine.
The receiver is rollmarked "SIG SAUER, INC., EXETER-NH-USA," and the ejection-port cover is marked "MULTI-CAL." The stock body is marked "M-MBP AR15/M16 .223," and the vertical foregrip is marked "RFG." No sights or optics are installed.
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: There are minimal handling marks from previous use. The bore presents bright and clean. Please refer to the photos for additional visual details.
What’s Included
- Binary trigger (installed)
- FAB Defense AG-43 pistol grip, tan (installed)
- Mission First Tactical React Folding Grip vertical foregrip (installed)
- SIG M-MBP carbine stock (installed)
- Two 30-round magazines: one MFT polymer magazine and one Magpul PMAG GEN M3 windowed polymer magazine
This MCX Patrol highlights the first-generation layout with an aluminum KeyMod handguard and a continuous Picatinny top rail, giving it the classic early MCX profile. The aluminum-alloy receiver carries the Exeter, New Hampshire rollmark, and the ejection-port cover is marked "MULTI-CAL."
The operating system is Sig's semi-automatic, short-stroke gas piston design paired with a 16-inch threaded barrel and a three-prong flash hider. The configuration is clean and functional, with no sights installed so the top rail remains uninterrupted.
The fire-control group has been upgraded with a binary trigger, and the selector is clearly labeled SAFE/SEMI/BINARY. Controls include an ambidextrous magazine release with a manual safety.
Ergonomics are enhanced by the SIG M-MBP telescoping carbine stock with a QD sling socket, the FAB Defense AG-43 tan pistol grip, and the Mission First Tactical React Folding vertical foregrip. Capacity is 30+1, and the rifle comes with two 30-round magazines: an MFT polymer mag and a Magpul PMAG GEN M3 windowed mag.