First Look: SIG Sauer MCX-Spear LT AR Conversion Kit

Easily add the MCX-Spear LT your existing AR-15 lower.

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posted on August 21, 2024
SIG Sauer MCX-Spear LT AR Conversion Kit

New from SIG Sauer is the MCX-Spear LT AR Conversion kit, an out-of-the-box, ready-to-go package for your existing AR-15 lower. The MCX-Spear LT AR Conversion kit has all the popular MCX parts bundled into one package. This kit includes the 16 inch 5.56 NATO upper assembly with an exclusive coyote-finish handguard, a folding/telescoping stock, a vertical grip and the Romeo4XT-PRO optic in FDE (Flat Dark Earth). The MCX-Spear LT line is designed to excel in any situation, with an adjustable gas system for suppressor applications along with durable, long-lasting and easily serviceable parts.  

MCX-Spear LT Features:

  • Adapts to any M4/AR15 mil-spec lower assembly
  • Dual-rod recoil assembly eliminates buffer system
  • M4 adapter and included telescoping coyote stock assembly
  • Romeo4XT-PRO red-dot sight with mount and flip-back lens covers
  • M-Lok vertical grip.
  • Adjustable gas system for suppressor optimization
  • Quick-change barrel design allows to easily and consistently swap calibers and barrel lengths
  • Gas-piston design reduces part exposure to carbon fouling
  • Designed to go 20,000 rounds before any part replacements
  • QD flash hider for clutch-lok adaptability and compatibility with SLX/SLH suppressors
  • Ambidextrous charging handle with gas deflector
  • Replaceable parts (cam path follower, feed ramp, forward assist/deflector, charging handle locking pins) allow for longer receiver life over standard AR designs.
  • Tapered bolt design functions more reliably and lasts longer than standard square lug M4 bolt designs.
  • Nitride-coated cold hammer forged barrel for optimal accuracy and barrel life

Romeo 4XT-PRO Features:

  • Illumination control moves to the top, providing easy access with either hand
  • Dedicated night-vision override switch makes short work of drastic changes in lighting conditions and by
  • Motion activated
  • Uses one AAA battery
  • Rated for 50,000 hours of runtime.
  • IPX8-rated for waterproof and fogproof performance and tested to MIL-STD-810

The items in the SIG Sauer MCX-Spear LT AR Conversion Kit would cost over $2,500 if purchased individually. However, as a bundle, the price is lowered to $2,199.99. Visit sigsauer.com for more information on the MCX-Spear LT AR Conversion Kit or other products made by SIG Sauer.

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