I was on the phone to the proof house last week and they told me that ALL imported guns needed proofing, that included the EU.
I've been trying to find a used Hawken for weeks, they just don't exist. You can fill a truck with them in the US, but here in the UK they are like hens teeth used.
I'm happy to buy new as they aren't exactly expensive and you get the comfort of getting new with, guarantee, no blemishes or rusty bore.