Thompson Center Contender 45cal muzzle loader barrel

Gonic 24" muzzle loader barrel for Thompson Center Contender, only 8 rounds down the barrel, will come with 4 packs of 20 bullets- the 8 I shot, also comes with grey laminate stock set, was originally for a gen 1 contender, I opened up the back for the hammer on the G2 Contender or trade maybe?