The shorter bolt and washer is in the grip - FAB Defense M4 Buttstock for Remmington 870

I’ve had no issues with about 100 rounds through my 870. The adjustability is very nice and the spring does offer a little bit of recoil softening. Like the title says, you don’t need to hunt around your parts box or order another bolt to attach the grip to the receiver. I was shopping for a shorter bolt when I found another review on another site say it was shipped in the grip, opened the compartment and there it was with the washer. No instructions were included which is no big deal, it does have a QR code but it’s just for the FD website.