Lots of people were making flint guns, good quality ones, after 1820 or even 1830. Fordney comes to mind.
The percussion system was NOT fully reliable until probably 1825-30. It was not fully TRUSTED till the 1830s-40s at least. The percussion is more reliable than flint *now* with our manufacturing tolerances but circa 1830 I am not so sure this is the case. Ignition was faster and its easier to shoot a percussion rifle. But reliability would have been close.
This is for AMERICA. In England the shotgun converted to percussion very rapidly. But they were WING shooters and they were in a fully civilized and populated countryside. The percussion shotgun is FAR superior to flint for shooting flying birds. According to George "English Guns & Rifles" the flintlock hung on longer with riflemen even in England.
Then we have the lack of percussion caps in fur company inventories as previously pointed out (this likely needs more research).
Then we have the various rifles ordered by the fur companies till 1840 at least, American Fur etc. flintlocks.
The worlds militarys did not adopt the percussion system until the 1840s.
The 1837 inventory noted in the previous thread on this subject show 10 of the 19 rifles as Hawkens and NO percussion caps. Who was using these rifles if they were percussion locks? Where did they get their caps??? Why so many Hawken rifles if they were so rare?
Yes the percussion system was in the west by 1830 but it certainly was not universal. I have a hard time believing that Jake and Sam would have refused to make a flint rifle for someone in a 1835. I understand they were still buying flintlock locks in the 1850s.
The natives hung on to flint ignition till breechloaders were common.
People did not rush to get their flint guns converted. In the far west the firearm was too important to survival to trust a radical departure from a trusted technology.
But there are journal entries of people having there guns "percussed" at frontier posts circa 1830s.
So caps were apparently available.
The caps in inventory thing needs more research.
Frankly I just can't see an 1837 inventory with no perc caps but they are not listed. Unless very few percussion guns were in use in the west at that time.
Dan