"...Order brass from Buff. Arms..." Reloading components require the U.S. export permit.
This is on Buffalo's 'shipping policy' page.
"We are unable to ship bullets, ammunition, barrels or rifle scopes out of the country unless you use the services of an exporter. If your country does not appear on our shipping list then we are unable to ship to you at this time."
Plus:
"Important: As it is impossible for our Shipping Department to stay current with those items that are prohibited for each Country, it is the customers responsibility to check import regulations of their Country. No refunds will be allowed for any items/orders refused by Customs, including seized items. No refunds will be allowed of shipping charges for items returned to us by Customs."