Here is some AAC data for 9mm silencers.

[rsilvers]

I just summed up some data.

In many cases we had lots of sessions over days or months (since last summer), and I averaged those together. This is far better than a single 10 shot average.

USP9 with American Eagle 147

SWR Trident 127.6, average of 17, 10 shot sessions (170 shots).
AAC Evo-9, 129.3, average of 24, 10 shot sessions (240 shots).
Gemtech MultiMount, 129.8, average of 11, 10 shot sessions (110 shots).
Gemtech Tundra, 130.8, average of 2, 10 shot sessions (20 shots).

Glock 19 with American Eagle 147

AAC Evo-9, 128.2, average of 9, 10 shot sessions (90 shots).
SWR Trident 136.2, average of 5, 10 shot sessions (50 shots).

[Kimbo]

I've seen data that varies depending on the weapon and the ammo. I agree though you can't go wrong with any of the suppressors because of the reduction is within a few decibels of each other. I just suggested one customer at the shop I loiter at to go ahead and get AAC Evo's for his 9, 40 and 45. Originally I told him about the KAC can for his .45 but he couldn't fathom why he would pay twice as much for it over a AAC can for a few decibels less. But to each their own...

[rsilvers]

Note that the Evo-9 and Tundra are 1.25 inches in diameter and the others are 1.375.