Loss in Accuracy

Yeah, I hear you about not messing with it. No, there wasn't anything wrong. I just wanted to take the barrel off to see if it would help me get the shroud off. I can't get the shroud off. Anyone know how? In terms of the alignment, I know it's aligned because I could see the set screw mark on the barrel lining up with the hole the set screw goes in, so everything is aligned. Shot it again today, and had a couple of sub MOA 50 yard groups. (and lots of bigger ones!), so maybe it was just me having a bad day yesterday. But there does seem to be flyers now when there wasn't before. 
 
There could be a chance the barrel shifted inside the shroud if you took them off as one piece. Most full lenght shrouds use the end of the barrel to support the front while attatching to the breech at the back. If this is the case with your fx the any movement of the barrel inside the shroud while off the gun can cause alignemt issues with the front of the barrel and shroud/baffles.