Hello to my gun guru! It is nice to post my opinion to you and for such a topic.
Many oriental long guns have their butts made from layers (see moukhala, jezails, tufeks, caucasians). Some references mention - indeed for adjusting for the gunner.
You have chosen and post very nice example for clarification my point of view.
In my opinion (so as medics say - evidence grade zero) the bottom tufek lacks its rear part. When you look at those guns they have always some decoration in the form of lines perpendicular to long axis, somewhere between a half or 1/3 of the lenght of butt. After that came the final part often made from different material or in different manner (burr wood, ivory, wood cut in other direction then the rest of the stock).
The bottom gun of yours has its decoration on till its very end.
So, when you ad some additional part to its butt you probably get the sufficient length.
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