Good approach.
Check the pinned posts in this section and keep it simple. Get parts from a Retailer (they can suggest manufacturers).
Start with the spring (let's say an M100 or equivalent), and metal bushings. Add a bearing spring guide. Perhaps add a better piston kit.
Wait for the barrel / suppressor option, you may not need it.
The rest is experience with tweaking the hopup to match your ammo's weight.
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