The charges stem from a July 2007 incident after a concert in new york when police found a loaded handgun in the rear door of his Maybach.
In January, Ja, 34, said that his album The Renaissance Project, would be released before he starts his prison sentence.
"Damn, some of u act like 18 months is forever," Ja Rule tweeted shortly after learning of his prison term. "It aint Hard to tell who the snitches are!!!…Renaissance Project will be dropping before I go in."
NEWS JUST IN ........
Ja Rule is going to wait a bit longer before learning when he'll start his prison term in a New York gun case.
Prosecutors said Wednesday that changes are needed in a presentencing report for the platinum-selling rapper and actor.
He's now due back March 9 to cement a sentencing date.
Ja Rule pleaded guilty in December to attempted weapon possession. The 34-year-old performer's plea deal calls for a two-year prison term.
Police said they found a loaded gun in a rear door of his luxury sportscar when it was stopped for speeding after a July 2007 concert.