Lancer SIG MPX 4.5" M-LOK Carbon Fiber Handguard

The Lancer SIG MPX Carbon Fiber Handguard is an OEM-style replacement handguard built specifically for the SIG MPX pistol-caliber carbine platform. Constructed from carbon fiber in a black finish, this handguard drops weight off the front of the platform while adding a rigid, accessory-ready mounting surface that complements the factory MPX lines.

At 4.5" in length, this is the shortest option in the Lancer MPX handguard family (also offered in 6.5", 8", 10", 14", and 16"), making it a natural fit for compact SIG MPX SBR and pistol builds where handling and maneuverability matter most. The drop-in design installs easily on the factory MPX, and a 1.6" internal diameter provides clearance for over-suppressor use.

M-LOK compatible slots are cut into the top, sides, bottom, and bottom-angle surfaces of the handguard, accepting M-LOK accessories and picatinny rail sections for lights, lasers, vertical grips, and forward hand stops. The carbon fiber construction keeps the front end light without sacrificing rigidity, giving any SIG MPX a direct, factory-friendly upgrade.