Sig Sauer MCX Spear LT: A Family of Guns

Nothing is more important than having well-made guns you can count on to perform as expected, and needed. The Sig Sauer MCX Spear LT is a title that encompasses a group of guns with various barrel lengths and chamberings; odds are there’s one or more that are a good fit for you. Whether you want a classic 5.56 NATO, a 300 Blackout for close quarters, or a 7.62×39, the gun company has you covered.

Sig Sauer MCX Spear LT
Whatever you’re looking for in an AR platform, the Sig Sauer MCX Spear LT line is diverse enough to fit your needs. (Photo credit: Sig Sauer)

Sig Sauer provides information regarding the MCX Spear LT:

The MCX platform has long been SIG SAUER’S breeding ground for developing the best rifle system in the world through extensive testing, continued innovation and customer feedback.  Now SIG SAUER introduces the latest evolution with the…MCX-SPEAR LT, based on its predecessor the MCX Virtus the…MCX-SPEAR LT has a lightened handguard with attachment screws for additional rigidity and a lightened profile barrel with improved accuracy.  Other features of the MCX-SPEAR LT include an ambidextrous bolt catch and release on its lower, coyote anodized finish, minimalist stock for maximum compact foldability and AR15 style trigger compatibility.  And the…MCX-SPEAR LT brings the long awaited addition of the 7.62×39 caliber to the MCX family.  Developed with a new latch system the 7.62×39 MCX-SPEAR LT was developed to handle the many varieties of 7.62 caliber ammunition while still maintaining reliability and smooth shooting.  The…MCX-SPEAR LT, has once again set the bar for modular weapons technology.

Sig Sauer MCX Spear LT
The Sig Sauer MCX Spear LT isn’t just one gun, it’s an entire family of guns. (Photo credit: Sig Sauer)

Features of the guns include:

  • Lightweight Ergonomic Handguard
  • SIG Flatblade Match Trigger
  • Fully Ambidextrous Controls
  • Interchangeable Barrels
  • SIG QD Suppressor-Ready Flash Hider
Sig Sauer MCX Spear LT
Yes, it even comes chambered in 7.62x39mm. (Photo credit: SIG Sauer)

Calibers available in the Sig Sauer MCX Spear LT line include 5.56 NATO, 7.62x39mm, and 300 Blackout. Barrels are made from carbon steel and have lengths varying from 9 inches to 16 inches. Handguards are M-LOK compatible and full-length Picatinny rails make it easy to mount whatever accessories you want to the guns. In addition, folding stocks reduce overall length to make the guns portable.

Flat Blade Match Triggers
Regardless of caliber, the guns have Flat Blade Match Triggers. (Photo credit: Sig Sauer)

MSRP varies by specific model.

Specs

Specifications of the Sig Sauer MCX Spear LT guns include the following, but there are other models available as well:

Model: RMCX-762R-16B-LT

  • Caliber: 7.62×39
  • Barrel length: 16 in [406.4 mm]
  • Magazines: (1) 28rd Steel Mag
  • Magazine type: AR-15 [7.62X39]
  • Action type: Semi-Auto
  • Stock type: Folding
  • Barrel material: Carbon Steel
  • Trigger: Flat Blade Match
  • Twist rate: 1:9.5
  • Forend type: Alloy
  • Grip type: Polymer
  • Receiver finish: Coyote
  • Overall length: 34.5 in [876.3 mm]
  • Overall width: 2.9 in [73.7 mm]
  • Height: 7.5 in [190.5 mm] without magazine
  • Threads: 5/8 in – 24
  • Accessory rail: M-LOK
  • Operating system: Gas Piston
  • Weight: 7.6 lb (3.5 kg)

Model: RMCX-556N-16B-LT

  • Caliber: 5.56 NATO
  • Barrel length: 16 in (406.4 mm)
  • Magazines: (1) 30rd Polymer Mag
  • Magazine type: AR-15
  • Action type: Semi-Auto
  • Stock type: Folding
  • Barrel material: Carbon Steel
  • Trigger: Flat Blade Match
  • Twist rate: 1:7
  • Forend type: Alloy
  • Grip type: Polymer
  • Receiver finish: Coyote
  • Overall length: 34.3 in (870 mm)
  • Overall width: 2.9 in (73.7 mm)
  • Height: 7.5 in (190.5 mm) without magazine
  • Threads: 1/2 in – 28 tpi
  • Accessory rail: M-LOK
  • Operating system: Gas Piston
  • Weight: 7.5 lb (3.4 kg)
Kat Ainsworth Stevens is a long-time outdoor writer, official OGC (Original Gun Cognoscenti), and author of Handgun Hunting: a Comprehensive Guide to Choosing and Using the Right Firearms for Big and Small Game. Der Teufel Katze has written for a number of industry publications (print and online) and edited some of the others, so chances are you've seen or read her work before, somewhere. A woman of eclectic background and habits, Kat has been carrying concealed for over two decades, used to be a farrier, and worked for a long time in emergency veterinary medicine. She prefers big bores, enjoys K9 Search & Rescue, and has a Master's Degree in Pitiless Snarkastic Delivery.

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