I have played airsoft for a while but I’ve never modded a gun. I have a krytac CRB and was wanting to convert it into somewhat a DMR (if thats what they’re called). Basically trying to extend the barrel and make it stronger. What all do I need as far as the barrel goes? And how do I find out the compatibility for the barrel,outer barrel, and shroud? For the gearbox, can I just buy a new whole gearbox and slide it in or do I need to build one myself. And also, what is the compatibility for that. And one more question… what are some other cool mods and stuff to do. (Please note that I’m on a budget) Thanks!