Patent ID: 8875432

Claim:
A firearm for implementing an improved 9 mm cartridge, wherein the improved 9 mm cartridge includes a 9 mm bullet associated with a 45-9 cartridge casing, wherein the 9 mm bullet weights at least 90 grains and wherein the 45-9 cartridge casing is configured to contain a propellant sufficient to propel the 9 mm bullet to a velocity of at least 1600 feet per second, the firearm comprising of a barrel, wherein said barrel is configured to operably interact with the 9 mm bullet; a chamber, wherein said chamber includes at least one chamber portion sized and shaped to operably associate with the 45-9 cartridge casing; and a free-bore, wherein said free-bore includes a first free-bore portion having a first free-bore portion diameter and a second free-bore portion having a second free-bore portion diameter, wherein said second free-bore portion includes a second free-bore portion wall that is tapered between about 1° to about 2° such that said second free-bore portion diameter is smaller than said first free-bore portion diameter, and wherein said free-bore further includes at least one free-bore portion sized and shaped to operably associate with the 9 mm bullet.