Sent everything included, And even tossed in a barrel nut wrench that doesn't come with the Geissele MK4 SMR. Buyer says that the barrel nut was missing so I searched thoroughly despite knowing it was in the box. The buyer demanded a full refund rather than a barrel nut replacement which was a red flag, especially at the deal I gave them. I regret the deal entirely as everyone who has dealt with me knows I'm very fair, And definitely not trying have negative interaction over a barrel nut.