I have seen these before. Folks would take a full stock of lets say a Springfield and then carve out the small (kids) musket. The big bulge you see is where the original width of the overall stock where the lock-plate went and then they carved it down from there. More photos would be great as I love to see these and its been a few years since Ive seen one.
Here are extras. It's a heavy little piece of metal. I used available ruler #3, with #2 being a Heath or Slot bar, and ruler #1 in perpetuity being the jumbo Reese's cups with pieces.
I just looked again at the pics. The sleek lines around the lockplate area led me to believe that maybe this is a Jenks or a low profile rifle like that.
The photos show me that its a lot smaller than the one photo you posted and its not and carved musket stock child's gun. It a lot smaller and metal, I have to agree with the post above gift shop item.
Here are extras. It's a heavy little piece of metal. I used available ruler #3, with #2 being a Heath or Slot bar, and ruler #1 in perpetuity being the jumbo Reese's cups with pieces.