I agree, buy the Halo Too. You will need to sand the hopper, or get the body cut down for a clamping feedneck. But either way, that hopper will do great.
Regarding barrel kits, I'd recommend looking for the Empire Sniper barrel kit. They're usually pretty affordable (~$75), have all the sizes you'll need, and shoot great. It's what I currently run on my Trilogy.
Personally, I'm not a huge fan of CP regs. I've seen too many of them have recharge issues. I prefer older WGP regs, like Ergo regs. Given their age, they typically need to be rebuilt. But they perform really well and can be had for cheap. As others mentioned, the stock valve will work fine on compressed air until you add a reg. Be aware that stock trilogies will inevitably start to have low velocity issues. The springs wear out very fast. You will need to replace the springs at some point.
As far as o-ring kits go, look for any autococker o-ring kit. That'll have most everything you'll need. There will be a few oddball sizes missing, but as far as I know there are no trilogy -specific o-ring kits available.
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