Hi,
Toot, I guess your question is an opportunity to clear up a lot internet misinformation about these and other British dueling pistols.
They were both flintlocks at the time of the duel and made by Robert Wogdon of London. The picture shows one was later converted much later after the duel to percussion. Also note the photo of percussion gun was reversed in the image. Both guns had locks on the same right side. When originally made, these pistols were stocked to the muzzle in wood and had standard hair triggers adjusted by a gunsmith. They were made during the late 1780s or early 1790s. During their useful life, the forestocks were removed and replaced by heavy brass. This was done to make them more muzzle heavy, which reduced the risk of a nervous dueler shooting high. Wogdon actually curved the bores of his barrels downward to correct that problem. This was verified by radiography in Stewart and Bailey's recent book on Wogdon. Unfortunately, physics ruled the idea did not work. The ramrods are replacements. One of the original rods likely had a removable brass powder measure as a tip. This was unscrewed from the rod, reversed, and then screwed back on for loading. The measure was filled with powder, positioned upright, and the pistol was inverted muzzle down over it. It was slid all the way to the breech and then turned muzzle up so all the powder was delivered to the breech directly and none stuck to the barrel walls. The story that the pistols had secret unknown and scandalous set triggers is rubbish. Hair triggers were the norm on fully evolved British dueling pistols. Both Burr and Hamilton had fought duels previously and it is unlikely they were unfamiliar with hair triggers. Dr. Hossack, a physician that accompanied Hamilton was told by the mortally wounded man, and I quote from Hossack's description: " take care of that pistol; it is undischarged, and still cocked; it may go off and do harm. Pendleton knows that I did not intend to fire at him."
dave