The Lage upper and .22 conversion are both must-have. I would highly recommend getting the Max11 upper with the 'tactical bolt' upgrade....this will increase the ROF to around 700-750 rpm. The stock Max11 bolt is slow at around 550 rpm. I'm actually now considering a speed bolt which is apprx 900 rpm.
The .22 conversion is a hoot. Get on the list now, the wait is up around 9-10 months for these. I have the conversion for the Max upper....if doing it over I would opt for the regular M11 conversion (easier to keep subsonic), but I'm about 3 months into the wAit for one of these and will just keep both.
I highly recommend a TM SG suppressor. It is very quiet considering the platform. It's also big, but blow back is non existent and it's quiet. Looks cool too, IMO. I will say that the GT Multimount is not a great match for the gun since there is a lot of gas in the face and it is not nearly as quiet as the SG. I suspect this is the case with other similar sized cans, the MM and Trident are close performers. HTH.