In the final scene of The Wolverine, Wolverine was left with only bone claws after his metal ones were sliced off by The Silver Samurai. For those of you who have been paying attention to the footage and photos from X-Men: Days of Future Past, you may have noticed that modern-day/future Wolverine appears to have regained his claws.
So what happened here? , Bryan Singer explains at Empire.
Director Bryan Singer explains that Magneto’s ability to manipulate metal might have something to do with it. The Master Of Magnetism could, perhaps, “reconstitute the adamantium claws… [Wolverine] has a different relationship with Magneto, and perhaps Magneto could forge them.”