I left the guy that tells me how to get the bullets for my buggy in mid sentence got impatient,actually didn't realize he was gonna mention it.
But anyways can anyone tell me how to get the bullets?Also how to get the ammo for other weapons on buggy?

Go see the vendor near the race track.

THanks

I think you can buy vehicle ammo from the weapons vendor in the shops as well. Just not the vehicle upgrades