I spotted this rifle over at longrangehunting.com. Is it anti-air artillery or a deer rifle? 
Built by a New Zealander … they sure know how to build a cool rifle.
Click to expand the photos
Beautiful scenery
The rifle has a custom suppressor with a muzzle break! Here is a close up:
I assume the “404″ refers to the 404 Jeffries.
my suppressed 7mm/404 which weighs 20 pounds all up, and pushes a 180 grain Berger at 3350 fps.
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The muzzle break on the suppressor seems to contradict itself. Does a break not make an already loud rifle louder?
It is a bit odd. A muzzle break directs noise towards to the shooter, it does not make more noise (at least in theory). The muzzle break could be on the rifle to reduce muzzle rise and recoil in order to get back on target faster.