The Sig Sauer MCX-SPEAR LT 9" Upper 300BLK BLK transforms a compatible M4 or AR-15 lower into a modern, compact platform with the proven MCX-SPEAR LT architecture. This complete 9-inch 300 Blackout upper assembly features a removable 3-prong flash hider on its threaded barrel, an extended free-float handguard with ample mounting slots, and a receiver extension delete adapter that supports vertical 1913 rail stocks or braces.

Ideal for shooters who want to run 300 Blackout in a short, suppressor-ready configuration, this upper is well suited for range use, training, and general-purpose defensive setups where compact handling and smooth recoil are priorities. The adjustable gas system, dual rod recoil assembly, and quick-change barrel design reflect Sig Sauer’s focus on innovation, reliability, and refined ergonomics.

Key Features:

• Manufacturer: Sig Sauer
• Model: MCX-SPEAR LT 9" Upper 300BLK BLK