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Methods and apparatus for operating a firing pin. A first force attracts the firing pin to the pre-firing position. A second force overcomes the first force to move the firing pin to a firing position. A magnitude of the first force on the firing pin is inversely proportional to the distance the fir

Methods and apparatus for operating a firing pin. A first force attracts the firing pin to the pre-firing position. A second force overcomes the first force to move the firing pin to a firing position. A magnitude of the first force on the firing pin is inversely proportional to the distance the firing pin moves away from the pre-firing position.

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1. A disrupter cannon for launching a provided projectile in a forward direction toward an explosive device to disable or destroy the explosive device, the disrupter cannon comprising: a barrel;a breech cap coupled to the barrel; anda firing assembly comprising a housing, a retainer, a magnet, a cov

1. A disrupter cannon for launching a provided projectile in a forward direction toward an explosive device to disable or destroy the explosive device, the disrupter cannon comprising: a barrel;a breech cap coupled to the barrel; anda firing assembly comprising a housing, a retainer, a magnet, a cover, and a firing pin, the housing is coupled to the breech cap; wherein: the retainer, the magnet, the cover, and the firing pin are positioned in the housing, the firing pin is positioned between the cover and the breech cap;the retainer has a bore therethrough;the magnet has a bore therethrough, the magnet is positioned forward of the retainer such that the bore of the retainer and the bore of the magnet align;the cover has a bore therethrough, the cover is positioned forward of the magnet such that the bore of the retainer and the bore of the magnet align with the bore of the cover;the cover is positioned between the magnet and the firing pin such that the firing pin does not contact the magnet;in a pre-firing position, the firing pin is proximate to the bore of the cover;a first force provided by an expanding gas via the bore of the retainer, the bore of the magnet, and the bore of the cover moves the firing pin away from a pre-firing position to a firing position to launch the projectile;as a magnitude of the first force decreases, a force of a magnetic field of the magnet moves the firing pin from the firing position to the pre-firing position. 2. The disrupter cannon of claim 1 wherein a magnitude of the first force acting on the firing pin overcomes a magnitude of the force of the magnetic field acting on the firing pin to move the firing pin from the pre-firing position to the firing position. 3. The disrupter cannon of claim 1 wherein after the first force moves the firing pin to the firing position, a magnitude of the first force decreases until it is less than a magnitude of the force of the magnetic field. 4. The disrupter cannon of claim 1 wherein the first force moves the firing pin with a momentum greater than a threshold for striking a provided cartridge to launch the projectile. 5. The disrupter cannon of claim 1 wherein as the first force moves the firing pin toward the firing position, a magnitude of the force of the magnetic field on the firing pin decreases. 6. The firing assembly of claim 1 wherein in the pre-firing position, the firing pin is in contact with the cover. 7. The firing assembly of claim 1 wherein in the pre-firing position, the firing pin covers the bore of the cover. 8. The firing assembly of claim 1 wherein the magnet has a donut-like shape. 9. The firing assembly of claim 1 wherein: the retainer further comprises a protrusion;the bore of the retainer is through the protrusion;the protrusion is positioned in the bore of the magnet. 10. The firing assembly of claim 1 wherein the bores of the retainer, the magnet, and the cover align coaxially. 11. A firing assembly for launching a provided projectile, the firing assembly comprising: a retainer having a bore therethrough;a magnet having a bore therethrough, the magnet positioned proximate to the retainer such that the bore of the retainer and the bore of the magnet align;a cover having a bore therethrough, the cover positioned over the magnet such that the bore of the retainer and the bore of the magnet align with the bore of the cover; anda firing pin; wherein: in a pre-firing position, the firing pin is proximate to the bore of the cover;the cover is positioned between the magnet and the firing pin such that the firing pin does not contact the magnet;a force of an expanding gas transmitted via the bore of the retainer, the bore of the magnet, and the bore of the cover moves the firing pin from the pre-firing position to a firing position to launch the projectile;as a magnitude of the force of the expanding gas decreases, a force of a magnetic field of the magnet moves the firing pin from the firing position to the pre-firing position. 12. The firing assembly of claim 11 wherein in the pre-firing position, the firing pin is in contact with the cover. 13. The firing assembly of claim 11 wherein in the pre-firing position, the firing pin covers the bore of the cover. 14. The firing assembly of claim 11 wherein the magnet has a donut-like shape. 15. The firing assembly of claim 11 wherein: the retainer further comprises a protrusion;the bore of the retainer is through the protrusion;the protrusion is positioned in the bore of the magnet. 16. The firing assembly of claim 11 wherein the bores of the retainer, the magnet, and the cover align coaxially.