Yes, as rgg7 says there is no 'list' for 4ts. Have a really good look on this site for no4ts - they can appear to be genuine ie the numbers in the right place etc - but if you've seen a lot of them you'll soon get the hang of if it looks 'right' or not - there are a lot here - and some in the Knowledge Libraryicon section.

Best to trust your own eyes - and buy the rifle not the story as they say! Bear in mind that there is a lot of fakery around. If in doubt ask if he minds you taking some pictures first and post them on here for the expert perusal.