Looks to be a nice late 40XB with a standard barrel, although I cannot tell for sure. If it is, there were not many that came that way, as most XB’s were heavy barrels. The only thing I see that detracts from the rifle is the rear peep sight. Not that there is anything wrong with the sight, just that it’s not the correct one for th rifle. Note that the stock has been relieved to accept the mounting. These rifles usually had Redfield sights, that fit without having to relive the stock.
I sold a XB standard barrel early this year without sights for 1800.00 It was a really nice rifle that showed little use, not collectors grade however.