ONe thing to remember is that under ITAR only a US company or individual can export Munition List items . The licence has to be obtained by the exporter and as the buyer all you can do is wait for the wheels to turn. YOu should plan on an mimimum of 60 days for the exporter to obtain a licence . If the item has been deemed dual use by the department of state the process should be easier. US companies are very wary of possible contraventions of ITAR as the financial penalties are severe.
http://www.pmdtc.org/ca_goodrich_and_L3_corporation.htm
http://www.pmddtc.state.gov/ca_boeingcompany.htm