What ragged ends effect it if I were to cut it?
Yes,it will mess with airflow. You will need to recrown the barrel. This video is a good guide. The tool is called a Reamer.
Also check out Lonex/ASG ultimate barrels. I've been impressed by the quality. You might be able to find a 292mm barrel as well.
PDi barrels,especially tightbores are second to none in quality and their distributor,Xfire,do custom lengths for 10$,using a precision lathe and all that stuff.
Personally I would not cut a barrel on anything but a lathe,it needs to be precise to get all the best performance out of it..
Avoid madbull steel barrels for the time being,some very bad machining issues about. Wait until they get their act together.
You can improve accuracy with a new hop up nub,improving the air seal,shimming the hop up unit and washing your ammo. New hop up units also help,Tokyo Marui,G&G,SHS and Lonex units are very good quality in particular.
Washing BBs does have a good effect,gets all the mold release crap off of it allowing the bucking to grip it better. I'd wash the hop up bucking too, it could still have some mold release crap on it from the factory. I wash all that stuff in fairy liquid.