Pooh Shiesty is serving 63 months -- or just over five years -- in federal prison for his role in a drugs and sneakers deal gone bad. 

The "Back In Blood" rapper could have gotten up to life in prison, but he plead guilty to a single firearms conspiracy charge earlier this year and got a reduced sentence.  He has about four years left with time served.

Here is the latest photo of Pooh from prison.

He obviously can't wear his signature ski mask when locked up, so he's taken on a more intellectual look.

Are you looking forward to new music from Pooh in about four years?