Maffs problem for my homies right?

Just suppose right , that this geezer and his gang of 9 squares are dissin' my possy and I don't have no choice, right, but to put a cap in his ***. The only Gatt available is me AK47 spud gun what is only accurate to within 6 feet at 100 yards and is being fired by my homey Brainstem who can only hit a barn door at point blank range on 1 in 3 attempts. OK so we is trying to set up a drive by shooting here but we only have a clip holding 100 rounds of Ammo and a skateboard and we need to be taking out all the squares. What is the maximum range from which Brainstem can successfully complete his mission. Big up to the West Side and a one fingered salute to the East side batty boys just in case they is hanging and pimpin' in the maffs section of Y/A.