The KAK Industry A1 Flash Hider delivers authentic retro styling with modern manufacturing quality for 5.56 NATO firearms featuring 1/2x28 threading.KAK Industry A1 Flash Hider1/2x28 thread pitch compatibility1.750" overall lengthHeat treated for durabilityPhosphate coating for corrosion resistanceMilled flats for easy installationAmerican-made quality constructionPerfect for builders seeking period-correct A1 styling with reliable flash suppression performance. Note: crush washer sold separately for proper installation.