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An accessory mounting interface for a firearm is provided. The accessory mounting interface has a firearm accessory, a first elongated fastener, a second fastener, and an elongated slot in a firearm. The second fastener has two straight edges parallel to each other, and at least one of the two strai

An accessory mounting interface for a firearm is provided. The accessory mounting interface has a firearm accessory, a first elongated fastener, a second fastener, and an elongated slot in a firearm. The second fastener has two straight edges parallel to each other, and at least one of the two straight edges prevent the second fastener from rotating beyond a closed position once a portion of the second fastener has passed through and at least partially cleared the elongated slot.

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1. An accessory mounting interface for a firearm having an elongated slot, the elongated slot having a length greater than a width, the interface comprising: a firearm accessory having at least one through hole extending from a first surface to a second surface of the firearm accessory;a first elong

1. An accessory mounting interface for a firearm having an elongated slot, the elongated slot having a length greater than a width, the interface comprising: a firearm accessory having at least one through hole extending from a first surface to a second surface of the firearm accessory;a first elongated fastener arranged through the through hole and having a first end extending below the second surface of the firearm accessory;a second fastener rotationally mated to the first end of the first elongated fastener and having a length greater than a width, the length measured along a longitudinal axis of the second fastener, the second fastener comprising two straight edges parallel to each other; and whereinthe width of the second fastener is less than the width of the elongated slot and the length of the second fastener is greater than the width of the elongated slot, such that the second fastener can pass through the elongated slot when the longitudinal axis of the second fastener is arranged parallel to a longitudinal axis of the elongated slot, but cannot pass through the elongated slot when the longitudinal axis of the second fastener is arranged obliquely to the longitudinal axis of the elongated slot,at least one of the two straight edges preventing the second fastener from rotating beyond a closed position once a portion of the second fastener has passed through and at least partially cleared the elongated slot,at least one of the two straight edges maintaining the second fastener arranged obliquely to the longitudinal axis of the elongated slot as the first fastener is rotated to tighten the first and second fasteners about the firearm accessory and the firearm. 2. The accessory mounting interface of claim 1, wherein the closed position is rotated 45° to 135° from an open position and wherein the longitudinal axis of the second fastener is parallel to the longitudinal axis of the elongated slot when the second fastener is in the open position. 3. The accessory mounting interface of claim 1, wherein the second fastener has one or more curved portions having a radius of curvature centered at a center of the second fastener. 4. The accessory mounting interface of claim 1, wherein the elongated slot is part of a handguard of the firearm. 5. The accessory mounting interface of claim 1, wherein the firearm accessory is selected from a group consisting of: a rail for mounting other firearm accessories; a sighting device; a lighting device; a sling mount; a grip; a cover panel, a bipod mount, and an adapter. 6. The accessory mounting interface of claim 1, wherein the longitudinal axis of the elongated slot is parallel to a longitudinal axis of the firearm. 7. The accessory mounting interface of claim 1, wherein the first elongated fastener is shaped so as to be rotated without the need for a tool. 8. The accessory mounting interface of claim 7, wherein the first elongated fastener has a second end, the second end is selected from a group consisting of: an arm, a disc-shaped handle, or a spoked handle. 9. The accessory mounting interface of claim 1, wherein a curved portion separates the at least two straight edges. 10. An accessory mounting interface for a firearm having an elongated slot, the elongated slot having a length greater than a width, the interface comprising: a firearm accessory having at least one through hole extending from a first surface to a second surface of the firearm accessory;a first elongated fastener arranged through the through hole and having a first end extending below the second surface of the firearm accessory and a second end having a flange shaped to engage the first surface of the firearm accessory;a second fastener rotationally mated to the first end of the first elongated fastener and having a length greater than a width, the length measured along a longitudinal axis of the second fastener, the second fastener comprising a plurality of straight edges; andthe width of the second fastener is less than the width of the elongated slot and the length of the second fastener is greater than the width of the elongated slot, such that the second fastener can pass through the elongated slot when the longitudinal axis of the second fastener is arranged parallel to a longitudinal axis of the elongated slot, but abuts an interior surface of the firearm when the longitudinal axis of the second fastener is arranged obliquely to the longitudinal axis of the elongated slot,at least one of the plurality of straight edges preventing the second fastener from rotating from a closed position when the second fastener abuts the interior surface of the firearm. 11. The accessory mounting interface of claim 10, wherein the closed position of the second fastener is rotated 45° to 135° from an open position and wherein the longitudinal axis of the second fastener is parallel to the longitudinal axis of the elongated slot when the second fastener is in the open position. 12. The accessory mounting interface of claim 10, wherein the elongated slot is part of a handguard of the firearm. 13. The accessory mounting interface of claim 10, wherein the firearm accessory is selected from a group consisting of: a rail for mounting other firearm accessories; a sighting device; a lighting device; a sling mount; a grip; a cover panel, a bipod mount, and an adapter. 14. The accessory mounting interface of claim 13, wherein the first elongated fastener is shaped so as to be rotated without the need for a tool. 15. The accessory mounting interface of claim 14, wherein the second end of the first elongated fastener has a shape selected from a group consisting of: an arm, a disc-shaped handle, or a spoked handle. 16. An accessory mounting interface for a firearm having an elongated slot, the elongated slot having a length greater than a width, the interface comprising: a firearm accessory having at least one through hole extending from a first surface to a second surface of the firearm accessory;a first fastener; anda second fastener rotationally mated to the first fastener, the second fastener comprising at least one straight edge; whereinthe second fastener can pass through the elongated slot when the longitudinal axis of the second fastener is arranged parallel to a longitudinal axis of the elongated slot, but abuts an interior surface of the firearm when the longitudinal axis of the second fastener is arranged obliquely to the longitudinal axis of the elongated slot;at least one of the first fastener and the second fastener is arranged through the through hole;the second fastener comprises a closed position and an open position relative to the first fastener, wherein the longitudinal axis of the second fastener is parallel to the longitudinal axis of the elongated slot when the second fastener is in the open position, and the closed position is rotated between 45° and 135° from the open position; andthe at least one straight edge prevents the second fastener from rotating from the closed position when the second fastener abuts the interior surface of the firearm and the first fastener extends through the through hole of the firearm accessory. 17. The accessory mounting interface of claim 16, wherein the elongated slot is part of a handguard of the firearm, and the firearm accessory is selected from a group consisting of: a rail for mounting other firearm accessories; a sighting device; a lighting device; a sling mount; a grip; a cover panel, a bipod mount, and an adapter. 18. The accessory mounting interface of claim 16, wherein the first fastener is shaped so as to be rotated without the need for a tool. 19. An accessory mounting interface for a firearm having an elongated slot, the elongated slot having a length greater than a width, the interface comprising: a firearm accessory having at least one through hole extending from a first surface to a second surface of the firearm accessory;a first fastener, wherein the first fastener is a female fastener; anda second fastener rotationally mated to the first fastener, the second fastener comprising at least one straight edge and an elongated portion that extends through a wall of the firearm and the firearm accessory; whereinthe second fastener can pass through the elongated slot when the longitudinal axis of the second fastener is arranged parallel to a longitudinal axis of the elongated slot, but abuts an interior surface of the firearm when the longitudinal axis of the second fastener is arranged obliquely to the longitudinal axis of the elongated slot;the second fastener is arranged through the through hole;the second fastener comprises a closed position and an open position relative to the first fastener, wherein the longitudinal axis of the second fastener is parallel to the longitudinal axis of the elongated slot when the second fastener is in the open position, and the closed position is rotated between 45° and 135° from the open position; andthe at least one straight edge prevents the second fastener from rotating from the closed position when the second fastener abuts the interior surface of the firearm and the second fastener extends through the through hole of the firearm accessory. 20. The accessory mounting interface of claim 16, wherein the first fastener is an elongated fastener threaded through at least a portion of the second fastener.