USarmy11b,
Beemiller does not sell parts, but if you have a problem and can swap the part yourself they will be more than happy to send them to you. A few items on the gun are IN HOUSE ONLY items, so if something like that needs replaced it would require you to ship the gun in.
I recently contacted S&W about buying a few small items for my 9VE Sigma, well the items I wanted to buy were small springs but its in an area of the gun that is considered Manufacturer Service Only and requires the whole gun be shipped to them in the event one of those springs need be replaced. So... do not second guess your C9 decision not one bit.