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The AAC BlackOut Flash Hider for 51T mounts eliminates muzzle flash on short barrels. Pingless design once torqued to the correct spec. This hider will allow most 13.7/13.9 barrel lengths to reach 16 inch overall length (OAL). Please verify length before pinning and welding for total length. The open-end, 3-prong design is inherently stronger than 4-prong units and is not subject to wear or erosion common with other designs.
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