Abstract: An over-barrel flash guard for use with a muzzle-loading firearm including a plate having a front surface, a back surface, and a periphery interconnecting the surfaces formed of an upper edge, a lower edge, a vertical long side edge, and a vertical short side edge with the side edges interconnected between the upper edge and the lower edge and with the plate further having a notch formed on the lower edge and wherein the notch has a narrow upper part and a wide lower part and wherein the lower part of the notch defines a holding space for removably holding a stock of a muzzle-loading firearm at a location near a flintlock thereof and the upper part of the notch defines a sighting window aligned with a sight on the barrel of the muzzle-loading firearm.