KAK Industry A2 Extended Flash Hider 1/2x28 TPI - $6.65 KAK Industry Extended Flash Hider. Extended version of KAK A2 flash hider. Will bring a 14.5" barrel to just over 16" with pin and weld. Features : - 1/2X28 Thread Pitch - Pre-Drilled Hole for Pin and Weld - OAL: 2.060" - Heat Treated -