ASE UTRA BoreLock Birdcage and HIPER FlashHiders The Hiper flash hider is an extremely efficient flash hider. The tapered alignment surface before the attachment thread effectively blocks fouling from entering the mounting surfaces and allows for ease of attachment and removal. HiPer flash hiders are available to a variety of weapon types, from .223 Rem up to .30 calibre. For those seeking a more traditional flash hider solution, we also have a BoreLock bird cage flash hider available in the same calibres. Available in .30/.338 or .223/5,6mm