AR-15 Modular Quad-Rail Gas Block.
Tactical advantage. Add four Picatinny rails in just one move. Attach a laser, flashlight, night vision device, iron sight... whatever you need for the task at hand. Even remove rails you don't want.
And the .750" inner diameter ensures your AR-15 Modular Quad-Rail Gas Block stays snug and secure, round after round! Installs easily with included screws.
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