Knights Armament AR15 Low Profile Gas Block .750
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Replacement Low Profile Gas Block for the SR-15/SR-16 series. This block has a 0.750” inside diameter and is secured by a pair of set screws, making it a good choice for use with the URX 4 rail. Also compatible with other KAC URX rail systems. This gas block is used on the Mk12 Mod 1 rifles used by the US military.
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