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A method of modifying a projectile includes removing material from an aft end of the projectile, and coupling a device to the aft end. The method may be used to convert a spin-stabilized projectile into a fin stabilized projectile, by modifying the aft end of a spin-stabilized projectile to accept a

A method of modifying a projectile includes removing material from an aft end of the projectile, and coupling a device to the aft end. The method may be used to convert a spin-stabilized projectile into a fin stabilized projectile, by modifying the aft end of a spin-stabilized projectile to accept a fin kit. The modifying may involve removing material with lathe, and may include forming external threads on the aft end that may engage corresponding internal threads on the device, to effect the coupling of the device to the aft end. The modification method allows versatility in employing projectiles, including existing stocks of projectiles. In particular the method allows spin-stabilized projectiles to be converted to more accurate fin-stabilized projectiles.

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1. A method of modifying a projectile, the method comprising: removing material from an aft end of the projectile; andcoupling a device to the aft end of the projectile;wherein the projectile is initially a spin-stabilized projectile; andwherein the device is a tail fin kit, such that the step of co

1. A method of modifying a projectile, the method comprising: removing material from an aft end of the projectile; andcoupling a device to the aft end of the projectile;wherein the projectile is initially a spin-stabilized projectile; andwherein the device is a tail fin kit, such that the step of coupling transforms the projectile into a fin-stabilized projectile. 2. The method of claim 1, wherein the tail fin kit includes a base, and fins hingedly coupled to the base. 3. The method of claim 1, further comprising, prior to the coupling, placing a slipping obturator onto the aft end. 4. The method of claim 3, wherein the step of removing the material includes creating a cutout for the slipping obturator. 5. The method of claim 1, wherein the step of removing the material includes removing a rifling band on the aft end of the projectile. 6. The method of claim 1, wherein the step of removing material includes removing the material with a lathe; andfurther comprising, prior to the step of removing the material with the lathe, securing the projectile to the lathe by inserting a first holder into a forward opening of a projectile body of the projectile, and a second holder into an aft opening of the projectile body. 7. The method of claim 6, wherein the lathe is a robotic lathe. 8. The method of claim 6, further comprising, prior to the step of removing the material with the lathe, removing an igniter of the projectile, to produce a pilot surface for the lathe; andafter the removing the material, replacing the igniter. 9. The method of claim 1, wherein the step of removing material includes forming threads on the aft end; andwherein the step of coupling includes threadedly coupling internal threads of the device onto the threads on the aft end. 10. The method of claim 1, further comprising: securing a casing to the device, making the projectile part of a cartridge.