SIG MCX-SPEAR LT 11.5" UPPER AR CONVERSION KIT – 5.56 NATO, BLACK
Not Yet Rated | Write the First Review SKU: 222-SIG-WUAMCXA-556N-11B-LT
UPC: 798681682539
MFG#: WUAMCXA-556N-11B-LT

SIG MCX-SPEAR LT 11.5" UPPER AR CONVERSION KIT – 5.56 NATO, BLACK

Transform Your AR into Elite-Grade Firepower – No Buffer Tube Required

Unleash the next generation of firepower with the SIG MCX-SPEAR LT 11.5" Upper AR Conversion Kit in 5.56 NATO (Black) – engineered for Special Forces and now available to serious shooters who demand cutting-edge performance. Built from the MCX lineage, this complete upper transforms any standard AR-15/M4 lower into a folding-stock-capable, gas piston-driven powerhouse with battlefield-tested reliability and modularity.

🔥 Why the MCX-SPEAR LT Upper Kit Dominates:

• ✅ Drop-in Compatible – Fits any M4/AR-15 spec lower, no modifications needed.

• 🛠️ No Buffer System Required – Dual recoil rods and rear deletion plate allow true folding stock use with a 1913 Picatinny interface.

• 🔧 Quick-Change Barrel – Swap calibers and barrel lengths on the fly for mission-specific builds.

• 🧪 Gas Piston System – Cleaner, cooler, and more reliable than DI; optimized for suppressed and unsuppressed fire.

• 🔇 QD Flash Hider – Ready for SIG’s SLH/SLX suppressor systems with Clutch-Lok tech.

• ⚙️ Adjustable Gas Block – Fine-tune for reliability across ammo types and suppressor use.

• 🔁 20,000 Round Service Life – Replaceable wear components extend lifespan beyond standard AR uppers.

• 🎯 Precision Barrel – 11.5" cold hammer forged, nitride-coated for superior accuracy and longevity.

• 💨 Ambidextrous Charging Handle with Gas Deflector – Designed for left- or right-handed shooters and high-volume fire.

What’s Included:

• Complete 11.5" MCX SPEAR LT Upper (5.56 NATO)

• Removable 3-Prong Flash Hider (1/2x28 thread pitch)

• Receiver Extension Delete Adapter (mount 1913 rail-compatible stocks or braces)

Built for Tactical Superiority

From CQB operators to high-speed civilian defense setups, the MCX-SPEAR LT brings forward a field-proven evolution of the AR platform. Its tapered bolt geometry, replaceable cam path, and gas piston efficiency deliver unmatched reliability in all conditions. You get the precision of SIG Sauer’s elite craftsmanship, now in a modular, mission-configurable upper.

Technical Specs at a Glance: