Ah, reining it in a little, eh?
Good for you. As far as the piston kit, wait. You can buy it later. Shoot the durn rifle you build first. Maybe you'll like it and can put what might be wasted money toward an optic or ammo or lots of magazines. Get the important stuff first!
Ever hear the old saying, "Chrome won't get you home"
? (In reference to chrome plated crap on your hot rod or Harley doesn't make it run better.) Maybe we can update that here to "Bling won't bring you in"
I think I just coined a new phrase!