I have a No.4 converted to .45-70. So far I'm using the original military surplus buttstock, which I'm not fond of at all. At one time there were quite a few sporter stocks around (and one from a No.1 can be modified to work with a No.4), but there are very few now, and most have a giant right-handed fugly Monte Carlo slab that does me no good at all.

Every now and then one of the old Bishop or Fajen stocks shows up on an auction site, but so far I've been outbid. Eventually I'll snag something I like.