KAK Industry Retro Duckbill Features The KAK Industry Retro Duckbill recreates the distinctive three pronged shape that defined rifles of the Vietnam era giving a modern 5.56 build genuine retro character. The 1/2x28 threading matches the standard pitch found on most 5.56 and .223 Rem AR-15 barrels so installation is straightforward with the appropriate crush washer which is sold separately. Bored to accept calibers up to 30 cal the Duckbill is versatile enough to be paired with a variety of AR platform builds beyond just 5.56. Its slim 1.76 inch overall length keeps the muzzle profile tight without adding unnecessary bulk to the front of the rifle. A black phosphate finish coats the exterior offering corrosion resistance and a low maintenance surface that matches most factory barrel finishes. KAK Industry built its reputation on producing American made components at accessible prices and the Retro Duckbill reflects that philosophy with solid machining and attention to historical detail. Builders restoring a retro upper or simply wanting a distinctive muzzle device will find this flash hider easy to install and visually accurate to the originals. It is a simple affordable way to finish off a period style rifle build with authentic flair. KAK Industry Retro Duckbill Specifications Manufacturer: KAK Industry Model: Retro Duckbill Type: Flash Hider Caliber: 5.56 Color: Black Finish: Phosphate Thread Pitch: 1/2x28 Overall Length: 1.76 Compatible Hosts: AR-15 Available At: GrabAGun