The Magpul MOE SL Mid-Length Handguard (brand part number MAG551-ODG) is an OD Green polymer hand guard built for AR-15/M4 rifles running a mid-length gas system. Magpul designed the MOE SL line as a lightweight, cost-effective alternative to aluminum rail hand guards, keeping the slim factory-style profile while adding modern M-LOK accessory slots. Reinforced heat-resistant polymer construction and an integral riveted aluminum heat shield stand up to sustained firing without adding rail bulk or weight. It’s a straightforward, direct-fit upgrade for shooters replacing a worn factory two-piece hand guard or building out a mid-length AR in OD Green.

Key Specifications

• Measures 10.9 inches long, sized specifically for mid-length gas system AR-15/M4 rifles.
• Features M-LOK slots at the two, six, and ten o’clock positions for direct-attach lights, slings, and grips.
• Built from reinforced, heat-resistant polymer for operational durability without aluminum rail weight or cost.
• Includes an integral riveted aluminum heat shield for added protection against sustained-fire heat.
• A large front extension and lower lip shield the support hand from the hot front sight assembly.
• Installs using the existing round front hand guard retaining cap and rear spring-loaded delta ring.
• Requires the A2 front sight assembly, since other gas blocks are not compatible with this design.
• Not compatible with piston-operated AR platforms.
• Finished in OD Green polymer for a color-matched build.
• Made in the USA by Magpul Industries.

Frequently Asked Questions

Will this fit my rifle’s front sight setup? It requires the A2 front sight assembly with a round front hand guard retaining cap and rear spring-loaded delta ring; other gas blocks are not compatible.

Does it work with a piston-driven AR? No, this hand guard is designed for direct impingement mid-length systems and is not compatible with piston-operated platforms.

What color options does this come in? This listing is the OD Green polymer finish; Magpul also offers this hand guard in other MOE SL colors.

Buy the Magpul MOE SL Mid-Length AR-15/M4 Handguard – OD Green

Drop the worn factory two-piece hand guard and pick up M-LOK real estate without the added bulk of an aluminum rail. Order it from our Magpul Industries lineup, part of our AR handguards selection, at our Lubbock, Texas gun shop for fast, direct shipping.