Hello folks!
I am new to this sport (love it so far

) and I purchased a G&G CM16 R8-L. What I am planning to do is upgrade it to a DMR.
I wanted to use a 80mm or 110mm suppressor and lengthen my inner barrel.
What upgrades would I need to do? I want FPS to be between 420-440 for game requirements. Or would I be better off just buying a DMR designated rifle?
Thanks guys!