The adapter that ati sells is it specifically made for suppressors? Is it precision machined to line up with the bore and provide a square mount on the shoulder? Or is this part more ment for adapting flash suppressors?
I was just curious because I installed one on my gsg 522p with the 9" barrel and I'm getting major baffle strikes. I pretty much wrecked my 2 end baffles. I'm figuring something definitely isn't square.
I was using cci standard ammo and Winchester subsonic.

I have some photos of the baffles on my phone but no site to upload them to.

Has anyone used this adapter with a suppressor?

Yup. Bought it from ati, put it on my SBR 522 and use a sparrow. Works great.

Use mine with my AAC Pilot and no problems.  Maybe your adapter is a blem, or maybe your barrel isn't installed correctly?