Guys I appreciate all the feedback. But I may go with the npas solution cuz it sounds alot easier. And I don't want to make any modifications to the gun whatsoever xD
So I'm thinking of getting a WE M4A1 GBBR "Open - Bolt" which is £299.99 which if I recollect is a good price for a WE GBBR. So... are you guys suggesting an NPAS install won't be beneficial for my gun. If not then what do you suppose I do to bring the fps to 350?
I'm looking to get a new m4. Price preferably between £100 - £200. Within 350fps. And if possible can it be on wolf armouries? Or any other reliable websites that will sell in 2 tone or spray paint