Oz3rR08zz

Hi, I'm new to airsoft only just started playing and bought a used G&G cm15 kr-cqb 8.5 off of a family member and seems low on power, is it worth upgrading and if so what upgrades can I add to improve the fps, fire rate etc. I think standard it's 305fps with a 0.2 bb I think the limit on sites I play at is 350fps with a 0.2bb. Thanks in advance.