The KAK Retro Extended Flash Hider features an authentic design inspired by the XM-177 Moderator engineered to extend a 10.5" barrel to legal non-NFA length when pin and welded.KAK Retro Extended Flash Hider6.15" overall length for legal compliance1/2x28 thread pitch for 5.56 NATO caliberHeat treated construction for durabilityPhosphate coating for corrosion resistanceMilled flats for easy installationPre-drilled 0.125" hole for pin and weld installationPerfect for builders looking to achieve legal barrel length on short-barrel AR-15 builds while maintaining the classic XM-177 aesthetic. Professional installation with pin and weld required for compliance.