The Magpul MOE SL Mid-Length Handguard (brand part number MAG551-FDE) is a drop-in handguard built for AR-15/M4 rifles running a mid-length gas system and an A2 front sight, finished in Flat Dark Earth polymer. Magpul molds it from reinforced, heat-resistant polymer to keep weight and cost down compared to an aluminum rail handguard, while an integral riveted aluminum heat shield protects your support hand from barrel heat. M-LOK slots at the 2, 6, and 10 o’clock positions let you add Picatinny rail sections or direct-attach M-LOK accessories for lights, slings, or grips wherever you need them. It installs using your rifle’s existing delta ring and round front retaining cap, so no armorer or special tools are required.

Key Specifications

• Built for AR-15/M4 rifles with a mid-length gas system and A2 front sight.
• M-LOK slots at the 2, 6, and 10 o’clock positions.
• Molded from reinforced, heat-resistant polymer.
• Includes an integral riveted aluminum heat shield.
• Large front extension and lower lip shield the hand from the hot front sight assembly.
• Installs with the existing delta ring and round retaining cap, no armorer needed.
• Not compatible with a triangular front retaining cap.
• Not compatible with piston-operated AR platforms.
• Measures approximately 10.9 inches long.
• Finished in Flat Dark Earth.

Frequently Asked Questions

Will this work on a piston AR? No, it’s not compatible with piston-operated AR platforms.

Do I need an armorer to install this? No, it installs using the existing delta ring and a round front retaining cap.

Does this fit a triangular retaining cap? No, it requires a round front handguard retaining cap.

Buy the Magpul MOE SL Mid-Length M-LOK Handguard for AR-15/M4 – FDE

Add real M-LOK accessory space without the weight or cost of aluminum. Order it from our Magpul Industries lineup, part of our AR handguards selection, at our Lubbock, Texas gun shop for fast, direct shipping.