422 shoots VERY high with suppressor

[Razerface]

I have a 422 that shoots great with no suppressor installed. With the suppressor on, it shoots 8-10 inches high at about 25-30 yds. I own 4 different rimfire suppressors and they all do it. There is zero evidence of any cap or baffle strike. I also changed out the adapter, with the same results. The same suppressors and adapters have no effect on the POI on my stainless 2206. Any ideas?

 

[kend]

It has to be an interference issue somewhere, the only way to really tell is to get an alignment rod and check it. I had a new Sig 322 for a customer and after hours of playing with it I finally found the adapter that came on it was bad but I couldn't see a mark on the end cap anywhere. New adapter fixed it.