12:11 PM PT -- 9/27 -- According to the police report, 2 fully loaded semi-automatic pistols were inside a Louis Vuitton bag Youngsta claimed was his.
11:25 AM PT -- 9/27 -- Blac Youngsta's attorney, Carl Moore, tells TMZ, "I have not been provided any evidence that suggests that Mr. Benson possessed a prohibited weapon. We plan to fight these allegations vigorously in court and expect that once the facts come out, Mr. Benson will be exonerated."
8:49 AM PT -- 9/27 -- Blac Youngsta has now been released from custody after posting $2,500 bond.
Blac Youngsta is behind bars in Houston after cops say the rapper was carrying prohibited ammo when they pulled over a car in which he was a passenger.
Law enforcement sources tell TMZ ... Youngsta and 3 friends were driving around H-Town Wednesday afternoon in a GMC Yukon -- with BY in the backseat -- when cops pulled 'em over for running a red light. We're told the officers smelled marijuana, so they searched the car and found 3 pistols and weed.
According to the criminal complaint, Youngsta is charged with felony possession of a prohibited weapon -- specifically, armor-piercing ammunition. It's unclear if the ammo was loaded in a handgun or separate.
We're told another passenger, Marcus Dion Cartwright, was charged with unlawfully carrying a weapon. The 2 other people in the vehicle were NOT charged.
Blac Youngsta is currently locked up in Harris County Jail.