1861 & "VR" (Victoria Regina) sounds like some form of Lee-Enfield (bolt action rifle)or Webly (revolver).
You say "stock" so that seems to imply a longarm like a rifle or shotgun though???
Its very little information to go on though. You don't even sat if it's a pistol, or rifle. Pictures, a detailed description, or even just a letter by letter copy of all the marks & the location on the gun will help to give you more.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”