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Gucci Mane is finally free ... getting sprung from behind bars 4 months early.

The rapper's lawyer, Drew Findling, tells TMZ Gucci was released Thursday morning from an Indiana prison. We're told he already has a home just outside the city. Findling says the rapper will be on house arrest for a few months and will then be on probation.

Findling and his team filed a motion months ago stating Gucci hadn't received credit for previous time served, and it looks like the judge agreed since he's out early.

Sources close to Gucci Mane -- who's been behind bars since September 2013 on a probation violation -- tell TMZ he's also ready to get back in the rap game.

His girlfriend, Keyshia Ka'oir, just posted a pic holding hands with who we're guessing is Gucci.

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