I was walking to my hunting spot today and had my Knight muzzle loader (209 primer in-line) slung on my shoulder. I stopped to rest a bit and the rifle began to slip. The gun hit the ground barrel first AND WENT OFF! I immediately check the safety and it was on. The bolt was backward and had not moved foward at all. The gun fired with saftey on and without the assistance of the bolt striking it. The 209 primer was blown from the inside out, it was not crushed as it is when the striking bolt hits it. Somehow contact with the ground detonated the gun. I had fired the gun a few days prior, but only once, and I did not clean it afterward. Immediately after the misfire I checked the trigger and it was jammed... probably because the gun had fired without the trigger bieng used. I brought it home, cleaned it, and it seems to work fine. Can dropping these rifles from say... 6-8 inches, barrel first, onto the ground cause them to misfire? Has any one ever heard of this happening? I cleaned the gun and now all appears normal. I wonder if the barrel hitting the ground forced air into the barrel... but why would that spark the gun and cause it to fire?