I was talking about the CZ Scorpion EVO, which has a pistol grip:I don’t see why you would need to permanently weld it. You are allowed one feature. Since the Ruger PC doesn’t have a pistol grip, it can have a threaded barrel. If it had a pistol grip, then the compensator would need to be welded.
As a CZ fan plus a lefty, I'm gravitating towards the Scorpion for myself. Haven't decided on faux suppressor or regular barrel with compensator. I'm thinking the former might make MA use easier if I can pin/get a fixed stock. Less options for maybe running a real suppressor down the road though.