Shop › KAK RETRO DUCKBILL FH 1/2X28 KAK RETRO DUCKBILL FH 1/2X28 $13.49 KAK Industry Retro Duckbill, Flash Hider, 556NATO, 1/2x28, Fits AR-15, Phosphate Finish, Black 1-2-28-DUCKBILL Quantity: Add To Cart Added! KAK Industry Retro Duckbill, Flash Hider, 556NATO, 1/2x28, Fits AR-15, Phosphate Finish, Black 1-2-28-DUCKBILL