scope base for fn patrol 308

hey yall im new here and i just got a new fn partrol 308. but i need a 0 degree scope base. I cant find one any were . it came with a 20 degree for shoting 300 plus yards. But i live in Georgia and all i need to shot is 0 to about 400 yards. dose any one know were i can get the base i need?
 
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