A2 Flash Suppressor 5.56/.223; Crush Washer 5.56/.223 for AR-15 1/2 x 28 thread. The Packaged - Flash Hider, A2 Kit - 5.56 comes packaged so it's easy to wrap as a gift for Holidays, Birthdays, or Other Special Occasions! Kit Includes A2 Flash Hider and a Crush washer. 1/2-28 Thread.