Buttstock should just be a bolt-on.
Remember, there is a Washer and Spring which have to be shifted over as well. See the factory exploded view of the rifle.
When swapping the Butt, be sure to remove the fore-end wood prior to swapping butts. Only takes a couple of minutes and prevents splitting your forestock.
As to your Weld, I must say that that is the ugliest one I have ever seen! DEFINITELY not Factory!