The SIG Sauer MCX, Virtus, and Spear LT platforms present a unique challenge for tactical light setup. Because the gas piston system requires a wider handguard profile than a standard AR-15, universal offset light mounts tend to push light heads out too far. This creates unwanted bulk, increases snag hazards, and makes thumb activation uncomfortable.

The Arisaka Defense Offset Scout Mount MCX addresses this geometric hurdle head-on. Engineered with an optic and handguard-specific bracket clearance, this mount tucks Scout-style lights snug against the MCX rail walls. Built-in lateral adjustment slots allow you to shift the light body sideways by up to 0.17 inches, giving you precise clearance around top-rail mounted lasers like the DBAL, PEQ-15, or NGAL.

Key Features & Benefits

• Tailored for SIG MCX Handguards: Custom geometry built specifically for SIG MCX, Virtus, and Spear LT rails to pull lights into a significantly lower profile than universal mounts.
• 3-Position Lateral Adjustment: Offers 0.17" of side-to-side mounting play, allowing you to tuck the light tightly against bulky IR target designators or front sight posts.
• 7075-T6 Aluminum Strength: CNC machined from ultra-tough 7075-T6 aluminum for superior clamping force and durability over standard 6061 mounts.
• Broad Scout Light Compatibility: Direct fit for Surefire Scout Light series, Modlite, Streamlight Protac HL-X (M-LOK versions), and Arisaka Light Bodies.
• Snag-Free Low-Profile Silhouette: Eliminates excess protrusion on the front end to keep your rifle maneuverable through tight corridors and barriers.

Technical Highlights

• Brand: Arisaka Defense
• Model: Offset Scout Mount MCX (OSM-MCX)
• Material: CNC Machined 7075-T6 Aluminum
• Finish: MIL-A-8625 Type III Hardcoat Anodized
• Weight: 1.1 oz (31g)
• Hardware: Low-profile steel M-LOK fasteners included
• Origin: Made in the USA

Applications

• SIG Spear LT & Virtus Light Setup: Positions weapon lights perfectly at 1 o'clock or 11 o'clock angles on factory MCX M-LOK handguards.
• Compact CQB Cable Management: Keeps light tailcaps flush to the top rail, simplifying wire routing for tailcap switches and dual-button remote pads.