Geissele’s Super Modular MK4 Rail is used by the Federal Bureau of Investigation due to its strength, modularity, and M-LOK compatibility. It features M1913 picatinny rails in the 6 o’clock and 12 o’clock positions, as well as shorter M1913 picatinny rails in the front 3 o’clock and 9 o’clock positions.
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Aero Precision APRA500704A Atlas R-One Handguard 12.70″ M-LOK, Black Anodized Aluminum, Full Length Picatinny Top, QD Sling Mounts, Mounting Hardware Included for M4E1/AR-15
$194.99
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