Less-lethal munition and mechanical firing device

A method for configuring a centerfire firing device to a non-centerfire device for firing a non-centerfire cartridge, the centerfire firing device including a trigger assembly and a slidable centerfire firing pin assembly for striking a centerfire cartridge, the method comprising:

• removing the centerfire firing pin assembly from the centerfire firing device;
• and
• installing an offset firing pin assembly into the centerfire firing device, wherein the offset firing pin assembly includes:
• an offset retainer including a first end and a second end;
• an opening extending through the offset retainer to the first and second ends;
• an offset firing pin disposed within the opening and capable of extending beyond the first and second ends of the offset retainer;
• and
• a biasing component configured to bias the offset firing pin toward the first end of the offset retainer, wherein in response to the offset firing pin receiving an impact force by the trigger assembly, the offset firing pin is configured to transfer the received force to impact the non-centerfire cartridge when loaded in battery position and in response to actuation of the trigger assembly.