Patent ID: 7849623

Claim:
A muzzleloading firearm for engaging a firing pin to discharge a primer, the firearm comprising: a trigger mechanism assembly connected between a front stock and a rear stock, the trigger mechanism assembly including a trigger plate having an upper surface and a lower surface, with a central cavity traversing the trigger plate between the upper and lower surfaces; a sear having a distal end and a proximal end, the sear positioned in the central cavity; a trigger in mechanical communication with the sear; a hammer assembly pivotally mounted to the trigger plate to rotate between a cocked position and a resting position, the hammer assembly comprising: a base extending into the central cavity through the upper surface, the base including an upper arcuate surface with a distal edge, a lower locking surface opposite the upper arcuate surface defining a shoulder, and an interior arcuate surface between the upper arcuate surface and the lower locking surface, and a head member connected to the upper arcuate surface of the base; a support member connected to the trigger plate forward of the hammer assembly, the support member having two grooves; an extractor slidably connected to the grooves of the support member; and a rolling breechblock connected to the support member and the extractor, the rolling breechblock pivotal between a retracted loading position and a firing position, wherein the rolling breechblock comprises a connector affixed with the support member and a curved upper surface opposite the connector, the curved upper surface engaging the distal edge of the upper arcuate surface of the hammer assembly when moving between the loading position and the firing position to force the distal end of the sear to engage shoulder of the base.