I have not seen the Saker yet.
A friend of mine has a M4-2000 on his 10" SBR AR. I have a Mini-4 on my SCAR 16. The report of SBR/M4-2K and SCAR/Mini4 is very similar, I can't say that one is louder than the other to my ears. I am very happy with my Mini-4. Using my Mini-4 on his SBR leaves a little to be desired. The M4-2000 on my SCAR is awesome sound wise, just a little long and heavy for my tastes.
On the subject of mounts; I recomend a muzzle break mount if you are using your suppressor on a short barrel rifle. I hate breaks but with a can the mount serves as an extra blast baffle. Here is a thread from another forum that illustrates the point very well
http://www.silencertalk.com/forum/vi...771&hilit=read