There were Springfield 1795 flintlocks used in the first year of the ACW and even most of that war in its western theater. Obvious by the 1795 date that the FIW and RW periods would be excluded. The Brown Bess was used early on by Confederate militia units and prison guards. The reason that it isn't used by the N-SSA competitors is the safety rules for loading imposed by lawyers & insurance companies.
ETA: Just checked N-SSA list of approved weapons dated 01/01/2022 and no flintlocks were listed.
Correct, 1795 Springfields but that date with FIW events....
The Charleville musket was issued to a substantial number of American soldiers during the ARW and was used as a prototype by the Springfield armory when they started production.
Probably there was a bias against using anything British in the years immediately following that war.
I don't have direct knowledge of their opinion, thusly qualifying my comment; but, have read texts that said that the 1766 was copied.
On Loyalist Arms site but not listed at muzzleloadershop.com/ in Arkansas. May be worth to call them at (870) 929-6257 or (501) 758-2222 to see if they can get it for you.
View attachment 180092
Linkage to Loyalist Arms musket
Price:
US $649.00 / Can. $780.00
Consolidated all my responses into one post.
IMHO, a Brown Bess may be your best choice. It is possible but probably better in theory than execution to get a percussion lock + conversion barrel for later period events.
Due to my family history of arriving after the last rendezvous, participating in the ACW and immediate years afterwards; I do N-SSA and SASS(ACW to the early frontier days). Reduces what I have to deal with to (1850-1888).
My advice would be to consider narrowing down the historical range to focus better on your persona.
That is my 2¢,