The Geissele Automatics Super Modular Rail Mk4 (brand part no. 05-1656S) is a 10.5-inch drop-in M-LOK handguard finished in desert dirt aluminum for shooters who want Geissele’s ultra-lightweight rail option. It integrates M1913 Picatinny rail sections at the 3, 6, and 9 o’clock positions near the muzzle end, while extensive venting along the rail body dissipates heat and cuts weight without giving up strength. M-LOK slots run at the 3, 6, and 9 o’clock positions as well as the upper 45-degree quadrants, giving builders flexibility to mount lights, grips, and other accessories exactly where they need them on an AR handguard platform.

Key Specifications

• Measures 10.5 inches in length for a carbine-length handguard footprint.
• Finished in desert dirt aluminum (DDC) for a distinctive tan-toned appearance.
• Uses a drop-in mounting style for straightforward installation.
• Features M-LOK slots at the 3, 6, and 9 o’clock positions plus the upper 45-degree quadrants.
• Includes integrated M1913 Picatinny rail sections near the muzzle end for sights or accessories.
• Extensive venting along the rail body dissipates heat and reduces overall weight.

Frequently Asked Questions

What color is this handguard? It is finished in Geissele’s desert dirt (DDC) aluminum tone.

What mounting style does this rail use? It uses a drop-in design for straightforward installation.

Does this rail have a top Picatinny section? Yes, it integrates M1913 Picatinny sections near the muzzle end.

Buy the Geissele Super Modular Rail Mk4 10.5-inch

Order this Geissele Mk4 rail from our Lubbock, Texas gun shop for fast, direct shipping to complete your build.