Extra Male Coupler and carbon fiber tube.  Specifically designed for third-generation U-RAC (3.0) and M-RAC (3.1) systems sold after March 2023.

Crafted with high-quality carbon fiber, the RAC tube guarantees durability in a lightweight package.  The listed lengths refer to the total length of the product, including the tube and coupler, providing complete coverage from the end of your rail to the end of your suppressor. Actual Tube Length is 0.75″ shorter than  listed length to compensate for the M-RAC and U-RAC coupler 

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