Mk 4 15" M-LOK Super Modular Rail, BLK
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specifications

Manufacturer:

Geissele Automatics LLC

Color:

Black

Platform:

AR-15

Length:

15"

    Mk 4 15" M-LOK Super Modular Rail, BLK

    Caliber Manufacturer Color Weight Merchant Price Merchant URL
    None Geissele Automatics LLC Black None None $375.00 Brownells Add

    Prices last checked September 2026. Prices and availability change often, so confirm on the retailer's site.

    The Super Modular Rail MK4 M-LOK™ is Geissele’s ultra-lightweight M-LOK option. These rails are purpose-built and feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o’clock positions. Maximum venting for heat dissipation also dramatically reduces the rails overall weight, while maintaining its same strong and rigid platform.

    The MK4 M-LOK rail features M-LOK slots at the 3, 6 and 9 o’clock positions as well as the upper 45° quadrants. This allows the user to keep the weight on the rail system down, while keeping the modularity and versatility to attach accessories as necessary.The rails include a .750" low profile stainless steel Geissele Gas Block.

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