Can anyone help date the hardware on this Virginia rifle stock?

[Flintlock1640]

I got this several years ago at a local yard sale. The barrel is a fairly typical early American large caliber rifled barrel in the Jaeger style. It has IH on the front sight which I believe is James Houston of the pre Revolutionary War Staunton area of VA. It had an obviously later period stock which had a back action lock after a normal lock so the whole is sad and hugh but one screw anyway so probably made with an old barrel in the 2nd quarter of the 19th century. I'm sure there is some demand for old iron Virginia hardware but I don't want to sell the stock and parts if the parts are 1770s like the barrel. Can anyone help out with that?

 

[Thagomizer]

Don't know much about Virginia rifles but from the looks of that narrow buttplate I would say it's much later than 1770.

 

[Hatchet-Jack]

Very interesting. Can you post some full length shots and a close up of the lock?

 

[Flintlock1640]

Very interesting. Can you post some full length shots and a close up of the lock?

Sorry didn't realize all the pictures didn't load

 

[rich pierce]

1820-ish. Narrow buttplate as said above, skinny guard. , rail close to wrist.