The KAK Retro Extended Flash Hider 5.56 NATO is designed to enhance your AR-15 setup while reducing visible muzzle flash. This flash hider is inspired by the classic XM-177 Moderator and features a 4.15-inch overall length, making it ideal for extending a 12.5" barrel to a legal non-NFA length when properly pinned and welded. Constructed with heat-treated materials and phosphate coating, it ensures durability and performance under various conditions. The product includes five flash hiding ports for effective concealment of the muzzle flash, and is pre-drilled at .125" for easy pin and weld installation. Please note, a crush washer is not included with the purchase.