Here's what I keep on hand:
two or three lower parts kits (one is a good start), 2 complete bolt carrier groups, two complete bolts, three sets of gas rings, two bolt upgrade kits from BCM, a spare buffer tube, two or three buffer springs, a couple trigger springs and hammer springs, two gas tubes, three firing pins, three firing pin retaining pins, a couple cam pins, take down pin detents and springs, and a partridge in a pear tree.
Get started with what you can and slowly you'll accumulate whatever you could need.
Then as others have mentioned, just build another AR to have on hand.
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