Jim; I only found two lines about Bird in "The Penn-Kent Rifle" by Kauffman, Listed under Lockmakers. Kauiffman also states "It is quite difficult in most cases to determine whether these people made their locks or bought locks and had their names engraved on them"
Bird, C. & Co. Philadelphia, Pennsylvania 1814
Bird Charles & Co., 170 High Street, corner of Fifth, Philadelphia, Pa. 1814
I have a rifle with a converted C. Bird lock, the rifle maker died in 1834. Every one of the several Bird locks I have encountered were originally made as flint locks and I have never found a percussion lock marked C.Bird Here is a pic of a Bird lock I found on the net marked as such:
C. Bird & Co.
Philad.
Warranted