Henry Ledford made many half-stock, percussion, Longrifles. He worked until 1853 and died in 1856. The rifle you are looking at would have been made around 1840, give or take five years. It has always been percussion. The rifle has late Davidson School architecture. The rifles he made after 1845 are of the Jamestown School architecture. That is what was selling at that time.
If you are interested in a more ornate rifle by this maker, I have one with 16 silver inlays that is for sale. It is the same architecture. Henry Ledford was a prolific maker of Longrifles. Many of his rifles survive.
Michael Briggs