Know what's the one weakness of HB devs? The necesity to setup to deal any real damage. Even with the perk it takes some time, not much, but it's that one second in wich you can get close... not anymore.
See, if you switch weapons during the bracing animation the game will remember the weapon is set up, so the next time you change the weapon back to the HB you will be instantly braced. So, so, so hillariously imba