Plies Has Felony Gun Charge Dropped After Airport Arrest

Plies just caught a break after being hauled out of an airport in cuffs this summer, because prosecutors are dropping the felony gun charge against the rapper ... TMZ has learned.

A county clerk tells us Plies was facing a felony charge for carrying a concealed firearm, but prosecutors dropped it after he completed a concealed weapons course. They'd also determined he had a valid permit for carrying a concealed weapon.

We broke the story ... Plies was arrested in September after a gun was found in his carry-on luggage as he was attempting to board a Delta flight in Tampa. TSA agents discovered a Glock .43 in one of his bags, as well as a fully-loaded magazine lying next to the firearm, and cops said Plies did not have a permit for the gun.

Sources close to Plies tell TMZ he grabbed the wrong bag by mistake, and admitted the gun is his.