Step 8: operation
This musket is designed to fire mini-marshmallows, but should be able to fire bits of potato, apple, grubs, or anything else you can fit in the tube.
If you are using something that won't easily slide down the tube, the threaded connection between the barrel and the ball valve can be undone and ammo placed in the barrel from that end.
If muzzle loading, be sure the valve is in the close position when dropping in ammo.
Close the valve and compress the pump about five times. Aim and release the valve to fire.