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A firearm for implementing an improved 9 mm cartridge is provided, 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 suffic

A firearm for implementing an improved 9 mm cartridge is provided, 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 may include a barrel, wherein the barrel is configured to operably interact with the 9 mm bullet and a chamber, wherein the chamber includes at least one chamber portion sized and shaped to operably associate with the 45-9 cartridge casing and a free-bore, wherein the free-bore includes at least one free-bore portion sized and shaped to operably associate with the 9 mm bullet.

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1. 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 p

1. 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; anda 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. 2. The firearm of claim 1, wherein said at least one chamber portion includes a first chamber portion having a first chamber portion length equal to about 0.7450 inches and a first chamber portion width equal to about 0.4660 inches. 3. The firearm of claim 1, wherein said at least one chamber portion includes a second chamber portion having a second chamber portion length equal to about 0.1146 inches and a second chamber portion width, wherein said second chamber portion width decreases from about 0.4660 inches to 0.3828 inches. 4. The firearm of claim 1, wherein said at least one chamber portion includes a third chamber portion having a third chamber portion length equal to about 0.1384 inches and a third chamber portion width equal to about 0.3828 inches. 5. The firearm of claim 1, wherein said at least one free-bore portion includes a free-bore portion length equal to about 0.1520 inches. 6. The firearm of claim 1, wherein said at least one free-bore portion includes a free-bore portion width, wherein at least a portion of said free-bore portion width is equal to about 0.3828 inches. 7. The firearm of claim 1, wherein said at least one free-bore portion includes a free-bore portion width, wherein at least a portion of said free-bore portion width is tapered from a free-bore portion width equal to about 0.3828 inches to a free-bore portion width of about 0.3550 inches. 8. The firearm of claim 1, wherein said at least one chamber portion includes at least one of a first chamber portion having a first predetermined tolerance range, a second chamber portion having a second predetermined tolerance range and a third chamber portion having a third predetermined tolerance range. 9. The firearm of claim 8, wherein at least one of said first predetermined tolerance range, said second predetermined tolerance range and said third predetermined tolerance range is equal to about ±10%. 10. A method for modifying a firearm to operably associate with a 45-9 cartridge, wherein the 45-9 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 propel the 9 mm bullet to a velocity of at least 1600 feet per second, the method comprising: obtaining a firearm having a first barrel, wherein said first barrel includes a first barrel threaded portion, a first barrel free-bore portion and a first barrel chamber portion, each of which is configured to operably associate with a .45 caliber cartridge; andreplacing said first barrel with a second barrel, wherein said second barrel includes a second barrel portion, a second barrel free-bore portion and a second barrel chamber portion, each of which is configured to operably associate with the 45-9 cartridge, wherein said second barrel free-bore portion includes a first free-bore portion having a first free-bore diameter and a second free-bore portion having a second free-bore portion diameter, and 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. 11. The method of claim 10, wherein said second barrel chamber portion includes a first chamber portion having a first chamber portion length equal to about 0.7450 inches and a first chamber portion width equal to about 0.4660 inches. 12. The method of claim 10, wherein said second barrel chamber portion further includes a second chamber portion having a second chamber portion length equal to about 0.1146 inches and a second chamber portion width, wherein said second chamber portion width varies from about 0.4660 inches to 0.3828 inches. 13. The method of claim 10, wherein said second barrel chamber portion includes a third chamber portion having a third chamber portion length equal to about 0.1384 inches and a third chamber portion width equal to about 0.3828 inches. 14. The method of claim 10, wherein said second barrel free-bore portion includes a free-bore portion length equal to about 0.1520 inches. 15. The method of claim 10, wherein said second barrel free-bore portion includes a free-bore portion width, wherein at least a portion of said free-bore portion width is equal to about 0.3828 inches. 16. The method of claim 10, wherein said second barrel free-bore portion includes a free-bore portion width, wherein at least a portion of said free-bore portion width is tapered from a free-bore portion width equal to about 0.3828 inches to a free-bore portion width of about 0.3550 inches. 17. The method of claim 10, wherein said second barrel chamber portion includes at least one of a first chamber portion having a first predetermined tolerance range, a second chamber portion having a second predetermined tolerance range and a third chamber portion having a third predetermined tolerance range. 18. The method of claim 17, wherein at least one of said first predetermined tolerance range, said second predetermined tolerance range and said third predetermined tolerance range is equal to about ±10%. 19. A method for modifying a firearm to operably associate with a 45-9 cartridge, wherein the 45-9 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 propel the 9 mm bullet to a velocity of at least 1600 feet per second, the method comprising: obtaining a firearm having a first barrel, wherein said first barrel includes a first barrel threaded portion, a first barrel free-bore portion and a first barrel chamber portion; andreplacing said first barrel with a second barrel, wherein said second barrel includes a second barrel threaded portion, a second barrel free-bore portion and a second barrel chamber portion, each of which is configured to operably associate with the 45-9 cartridge, wherein said second barrel free-bore portion 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, and 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. 20. The method of claim 19, wherein said obtaining further includes, modifying at least one of said first barrel threaded portion, said first barrel free-bore portion and said first barrel chamber, such that at least one of said first barrel threaded portion, said first barrel free-bore portion and said first barrel chamber is configured to operably associate with the 45-9 cartridge.