PF-040 small parts kit contains the following:
3 detent/pivot pin springs
4 KNS nitride coated detents
The odd numbers of included components probably deserve some explanation. Even for experienced AR builders, it's not uncommon to launch the pivot pin detent into a black hole. It's also fairly easy to bend the take down pin detent spring during installation of the end plate and castle nut.
We include 4 detents in case one or more gets lost, and 3 springs in case one gets bent.
When ordered by itself, the kit is shipped via first class mail (no tracking).