I mentioned the Manimal Extended Flash Hider back when it was being developed in 2012. It was vaporware for a while and I lost track of it. It was brought back to mind during a conversation with an industry friend and I was happy to find that it did finally make it to market.
The Manimal Extended Flash Hider occupies a unique space among flash suppressors. It is designed to be long enough to be permanently attached to a 14.5″ barrel to bring it to a legal length of 16″. It is also narrow enough that the gas block and barrel nuts can be passed over the device (as long as the pin and weld are cleanly finished). That means that you can easily swap hand guards without having to remove/destroy your muzzle device.
Check out the Manimal Extended Flash Hider at Adams Arms.