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Sig Sauer MCX SPEAR-LT 5.56 NATO 16" 1:7 Bbl Coyote Brown Rifle w/(1) 30rd Magazine RMCX-556N-16B-LT


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New for 2022, the MCX SPEAR-LT by Sig Sauer is the next generation of the renowned MCX platform. Building off the success of its predecessors, the MCX SPEAR-LT combines the lightweight modular design of the MCX Gen 1 with the durability of the MCX VIRTUS, resulting in a system that is lightweight, durable, modular, and accurate. To ensure maximum ruggedness and rigidity, the MCX SPEAR-LT’s handguard incorporates 2 additional screws in the handguard to provide maximum deflection capabilities, allowing more accessories to be added to the handguard without interfering with the rifle’s point-of-aim/point-of-impact. The handguard is also lighter than prior versions, and was designed with an emphasis on ergonomics. Similar to the handguard, the barrel has a reduced weight but has a slightly larger contour, promoting greater accuracy without adding unnecessary weight. The barrel is topped with a QD Flash Hider and uses a proprietary Cluth-Lock design for use with a suppressor.

Other features of the MCX SPEAR-LT include a newly designed stock system and lower. The stock is foldable and uses a push button release similar to the one found on Sig’s Cross rifles for rapid deployment. The stock’s overall design is akin to the Minimalist Plus stock that the MCX Rattler uses, but is slightly larger and includes a cheek piece to accommodate the use of higher mounted optics. The lower on the other hand features fully ambidextrous controls such as a M400 style bolt catch, and is compatible with standard MCX and MCX VIRTUS upper receivers. In addition, the MCX SPEAR-LT’s trigger is the Matchlite Duo, but a firing pin latch in the bolt carrier allows an AR15 style trigger or any MCX trigger to be used.

Features of the Sig Sauer MCX SPEAR-LT:

  • Handguard: Lightweight, ergonomics design. Features 2 additional screws for maximum rigidity, allowing more accessories to be added without effecting point-of-aim/point-of-impact
  • Barrel: Lightweight, features a slightly larger contour for greater accuracy and a QD Flash Hider with Cluth-Lock design for use with a suppressor
  • Stock: Foldable with push button release for rapid deployment, features a more robust design, and ships with a cheek piece
  • Lower Receiver: Fully ambidextrous controls, compatible with standard MCX and MCX VIRTUS upper receivers
  • Trigger: Matchlite Duo, firing pin latch in the bolt carrier allows an AR15 style trigger or any MCX trigger to be used


  • Caliber:5.56 NATO
  • Weight:7.5 lbs
  • Rifle Overall Length:34.3 inches
  • Action:Gas Piston - Semiautomatic
  • Trigger:Matchlite Duo Flat Blade
  • Safety:Ambidextrous
  • Rifle Barrel Length:16 inches Carbon Steel
  • Rifle Barrel Twist:1:7"
  • Rifle Stock:Minimalist Plus Stock
  • Scope Mount:Full Length Picatinny Rail
  • Magazines Included:1
  • Caliber or Gauge:5.56 x 45mm NATO
  • HandednessAmbidextrous
  • Item ConditionNew
  • Product TypeRifles
  • UPC798681660872
  • MPNRMCX-556N-16B-LT

Customer Reviews

Average Rating
May 28, 2023

Incredible rifle. 700 rounds through it so far with no failures of any kind with the last 300 or so being suppressed. I was initially disappointed with the accuracy after shooting 2-3” groups at 100 yards. After checking the torque on the barrel bolts, it’s now a 1” gun at 100 +/- .25” depending on the load. Excellent 2 stage trigger that doesn’t need replacing. It’s definitely taking the spot as my go-to rifle.

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