I have a mini in 7.62x39, works great. Loud as hell.
You might not want the Bulgarian/flaming pig on there, it's heavy and you shouldn't need to extra back pressure. It's an adjustable gas system, it's not going to beat anything up unless you keep the gas turned up all the time (break-in excluded).
Check out Spikes or Battlecomp. You should be able to use any of the .308 brakes on there like so, http://www.spikestactical.com/new/z/...308-p-927.html