Casanova, who's locked for attempted murder, racketeering, and drug trafficking, has been making moves on social media that suggest he may be thinking about working with the Feds.

6ix9ine discussed that and Bobby Shmurda during an interview with his boy DJ Akademiks.

"He trying to soften the pillow," 6ix9ine said about Casa's social media musing, arguing that Casa is going to snitch because he's facing a lot of Federal time.

Ak disagreed:

"Unlike you, he was doing so much in the streets.  He's been in jail in so many," he said about Casa.

Then they moved on to Bobby Shmurda, who returned home after serving six years to a hero's welcome.

6ix9ine said that it was easy for Bobby not to snitch because he wasn't facing what he was facing.

"Bobby was five years, he took his seven [for Rowdy Rebel].  I was facing 47 years.  How can you compare that?"

Ak wondered if 6ix9ine was really facing 47.  6ix9ine told him that the Feds don't mess around, and Ak agreed.

"Bobby had a state case, you had a Federal, Feds don't play," Ak conceded.

6ix9ine also claimed that if he was looking at more like five years -- and he wasn't afraid his former Nine Trey bros were trying to kill him -- he would have not taken a deal and would have lived like a king in prison.

Do you buy that?