CA SAW Upgrade Question
 

I have a CA para saw with the MK46 MOD O. I have a systema barrel and a 120 spring. I am looking for some more mods to make this gun rip. Does anyone have any suggestions that I could look into. I would like to keeo it shooting around 440 fps

Replace the piston firstly and next you could look at a torque-up gear set. A better head set wouldn't be a bad plan either and remove that cylinder grease they use in there. Go to a silicone based grease, like the CA grease that remarkably they don't use in their own guns.

Use a quality bb with any tightbore barrel and not just any volume priced junk. You'll love it for the consistancy in shots, lack of jamming and smooth operation.