17th Century English Lock Cavalry Pistol (field test prototype).
LARP safe foam firing firelock.
Based on an existing English (or Doglock) pistol, this was a large pistol commonly used by cavalrymen.
The lock is a fully working copy of a flint lock, with both full and half cock positions, as well as a safety at half cock which makes it hard (though not impossible) to fire the pistol, in addition the external sear is movable and can be used to retain the cock.
Fires the same foam ball ammunition as the Larpquebus® with a range of around 9-10 meters, and well under the 1 joule limit (required in the UK to ensure the blaster does not fall under the legal category of lethally barrelled!)
Otherwise its the same general operation as the Muzzle loading Musket (Larpquebus) I posted here a while ago.