Are narcissists able to have or be real friends?

After dealing with a couple covert narcissists I wonder: Are they able to have friends? Or are you able to be friends with them?

I see they have a lot of "friends" but they seem lonely.

They tend to befriend your friends to make them their flying monkeys. Do you think they are able to sustain their friendships or do they destroy them like they do with romantic relationships?