You have really opened a can of worms, everyone has their own opinion of what modifications to do.
Personally, I have changed the trigger to a CMC 3 1/2 # unit and installed a metal free float fore end using a Tacticool adapter nut. To me, the metal fore end improves the balance of the rifle.
Some standard AR parts will interchange, some won’t. AR triggers will fit with longer pins but not all will reliably ignite rimfire ammo. The CMC will.
Any free float will work, with the Tacticool adapter.
As to spare parts, firing pins and extractors are all I could recommend. Volquartsen makes both. The ejector is fixed to the barrel and is not replaceable but seems to last for ever. I’m right at 20,000 rounds on my rifle, one guy I shoot with is over 50,000 with only firing pin replacement every 15,000 rounds or so.
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