Abstract: Ammunition cartridge for simulated firing using a laser beam, this comprising a casing which is bored longitudinally and provided with, at the inlet of the bore, a percussion cap, the outlet of the bore fitting the orifice of the firearm barrel, its external form including additional forms of a casing and a conventional bullet.

Abstract: A muzzle loading firearm has a barrel bore into one end of which is force fitted a breech plug. The barrel wall has a radial aperture through one side and a diamaterally opposed recess in its inner surface, and the breech plug has a diamaterally extending passage aligned with the aperture and recess in the barrel wall. In one embodiment, a bolster is force fit into the barrel aperture, breech plug passage and barrel recess. The breech plug has a bore in its inner end communicating with the passage therein, and the bolster has a flash chamber and passage aligned with the breech plug bore.

Abstract: A muzzle loading firearm includes a barrel having a bore and a breech plug closing the breech end of the bore. An aperture in the barrel adjacent the breech end is adapted to mount a bolster which extends into the breech end of the bore. A flash transfer orifice communicates with a flash chamber in the bolster which in turn communicates with the breech end of the bore to permit firing of a powder charge contained therein. The firing chamber has an end wall located transversely opposite the aperture so that firing forces which would otherwise tend to bias the bolster outwardly of the aperture are resisted by firing forces acting on the end wall. Rearward biasing of the bolster against the breech plug by the firing forces is resisted by seating of the bolster within the aperture.