You need to chrono it to see what fps it is actually supplying and if it says it should do 450 out the box u shouldn't need to upgrade it unless if course it's below 300fps maybe. Also why do you need it to have a high fps?
its just i shot my m8 from 80yrds away and he said he didnt really feel anything i just want it to be able to hurt it might be just me as i have never been airsofting before as i am no were near a site but 80 - 100 yrds dosnt feel very far away but it doesnt help i am only using .25 bbs bcuz i cant find a website that has any heavier bbs in stock
but yes thankyou i will look for a chronograph just to be shure