Gents, thanks for replying.
Walt, I'm very sure this rifle is mint and orginal because I know the guy who's selling it (he doesn't need the money so that's why the price is nice). He also bought a 551 later and liked it so much that the 510 remained in the vault most of the time.
It was bought new about 5 years back and only fired during 20 range sessions (about 1000 rounds went through it in total).
Please note that I'm in Holland and am not affected by the steep prices in the US for these type of non-importable rifles.
If I get it it will not be fired much, it's more of an investment (I tell the mrs....). She is a bit worried because only a few months ago I already bought a Blaser R93 'Tactical' bolt matchrifle....
Cheers,
RG.nl