"Rap Devil" wasn't the first time Machine Gun Kelly came after Eminem with bars. He also took a shot at him as a feature on the Tech N9ne track "No Reason," which was released in March of this year

I pop cherries and popstars, you popsicles is not hard
Popped in on the top charts out the cop car
To remind y'all you just rap, you're not God
And I don't care who got bars," MGK rapped.

That's what Shady was responding to when he attacked MGK on the Kamikaze track "Not Alike" -- and dropped Tech N9ne's name.

“But next time you don’t gotta use Tech N9ne. If you wanna come at me with a sub-machine gun.
And I’m talkin’ to you, but you already know who the fuck you are, Kelly.
I don’t use sublims and sure as fuck don’t sneak-diss
But keep commentin’ on my daughter Hailie," Eminem rapped.

In a new interview with HipHopDx, Tech N9ne addressed being a part of the Eminem-MGK beef, explaining he had no idea when "No Reason" dropped that MGK was coming for Eminem in his guest bars.

"I don’t have time to dabble in the bullshit but I get it now," the Kansas City legend told HipHopDX. "MGK called me the next day and was like, “Tech man, I’m sorry man. I would’ve given you the Rap Genius breakdown at the beginning to let you know.’ I was like, “Nah man, I just didn’t know that you was going at him like that. I didn’t think that you would do that. He was like like ‘you know, we’ve been going at it for a while over his daughter.’"

Tech N9ne also confirmed that Machine Gun Kelly is still blackballed at Eminem's Sirius XM Radio station Shade 45 for his six-year-old comments about Eminem's daughter Hailie. 

"It was a weird situation because when I was promoting my song, I went to Rude Jude on before my album came out on March 2nd when I was making my rounds. And I went up to Jude and I was like, ‘This is my new single it’s called “No Reason” with MGK and one that’s called “Don’t Nobody Want None.” I wanna play both of them and then in between us talking he covered the mic and told me “I can’t play the MGK one,” and I was like “oh okay” and after we went to another break I asked him what’s up with Marshall and MGK and he said a long time ago [MGK] said something about his daughter and I was like, “Oh, I remember that. That’s still going."

Eminem has denied blackballing Kelly.