Ah! There it is... the holy grail of Christmas gifts! The Red Ryder 200 shot ranged model air rifle... What I want for Christmas is a Red Ryder BB Gun.
In a nod to the holiday classic A Christmas Story, this year's WoW in-game Christmas gift is your very own Red Rider Air Rifle. You get it from the Winter Veil Gift underneath the Winter Veil Tree.
You use it to cast the spell Pelted! which expands one of the 200 charges the Red Rider Air Rifle has. You'll want to fire off the gun to the faction leaders first to get your BB King achievement (Alliance version, Horde version). You can miss with the gun, so do the achievement before blowing the rest of the charges.
For additional information on all the Winter Veil achievements, check out our Over Achiever's Guide to Winter Veil. This gift is active on the EU servers, and as of 8:00 a.m. EST, the gift now appears active on the US/North American servers as well.