9mm AR pistol.

[Dentite]

... May go ahead and get a can but will most likely get it for 5.56. That way I could use it on my SBR, 5.56 pistol and my other AR's.....

If you are think you will only shoot 5.56 suppressed, go for it. But do some reading on .30 caliber cans. A .30 can would certainly be more versatile if you have calibers to suppress greater than 5.56. I've been very happy with my experiences using a .30 can on a 5.56. Just something to think about.