Gift/ I wanna build one to match

[Uriahs]

My grandfather in law gave me this old gun of his for my birthday. Said he bought it years ago when he lived in Kentucky intending to mount it over his fireplace.
As history goes he never did and the house burned down ages ago. He always had a liking for the blonde finished rifles but I never knew why, until now.
It has been fixed by who know who, just a wall hanger. I haven't the heart to take it apart and look for any makers marks but I would love to build him a copy so he has one to shoot and hunt with.
40 in. Barrel - I do not have a bore gauge, it measures 3/8 inch inside diameter so .36cal?
56 in. Overall length
LOP 14-1/2
Drop at heel 4 in.
Double set triggers
Back Action Percussion Lock
So I am no prefessional, definitely a greenhorn. If anyone has any good info on the stock style and general advice that might help me find either an appropriate kit or what have you I would REALLY appreciate any help. I wanna build one of these for my wife's grandpa.

 

[Phil Coffins]

Finding one with a back action lock will be difficult. Good luck.

 

[billraby]

You won't find a kit that will match it. Build from a blank instead. That is easier than building from a kit.

 

[boberator]

Here is a lock that is similar. Track of the Wolf has these in left and right hand.
https://www.trackofthewolf.com/Categories/PartDetail.aspx/763/1/lock-lr-700

 

[Eric Krewson]

I think the back action lock was a later addition, the drum isn't supported correctly and it looks like it may have been inletted for a different lock at one time.

 

[Uriahs]

I think the back action lock was a later addition, the drum isn't supported correctly and it looks like it may have been inletted for a different lock at one time.

That is what I had thought, either a later date percussion conversion from a flintlock, or its been dropped and broken badly. The stock has been repaired and if I could take better photos you'd see it's been all busted up.

 

[Uriahs]

You won't find a kit that will match it. Build from a blank instead. That is easier than building from a kit.

I did find some really nice blanks from pecatonica I'm going to buy. And a lock from track of the wolf. I'll have to look around for a barrel and breechplug

 

[boberator]

I did find some really nice blanks from pecatonica I'm going to buy. And a lock from track of the wolf. I'll have to look around for a barrel and breechplug

You might ask Petonica if they would inlet the blank for the barrel and ramrod but leave the rest of the blank so you can shape the stock. If you haven’t done an octagonal barrel channel and drilled the ramrod hole before, that will leave you to focus on duplicating the other measurements. It wouldn’t really be cheating and gives you more freedom on the rest of the shaping. You would need to let them know you have a particular wrist design and a back action lock.

I think they could do that just inleting off the right side of the blank as you would do if building from scratch.