I wonder if these finds are still the the oldest known handgun fragment from a medieval battlefield? The article is from May 2010:
Two men have discovered what are believed to be the earliest known fragments of battlefield handguns, which are thought to have been used at the Battle of Towton, fought in northern England in 1461. The find has been described as being of “genuine historical importance” and both men talk to presenter Jamie Coulson from BBC One’s Inside Out programme at 7.30pm on Monday 22 November.
Metal detectorist Simon Richardson and archaeologist Tim Sutherland found the fragments on the former battlefield of Towton near Tadcaster where 28,000 men are believed to have been killed more than 500 years ago during the Wars of the Roses.
It doesn't look much, but the above are the fragments of the pistols. The archeological site previously yielded the oldest known bullet.
Towton was arguably the bloodiest battle in English history--about 28,000 men slain in 12 hours.