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An upper receiver for a weapon, the upper receiver having a plurality channels each being oriented in a first direction and wherein each of the plurality of channels intersect an elongated channel extending in a second direction; a modular rail having a pair of securement features configured to be s

An upper receiver for a weapon, the upper receiver having a plurality channels each being oriented in a first direction and wherein each of the plurality of channels intersect an elongated channel extending in a second direction; a modular rail having a pair of securement features configured to be slidably received within a pair of the plurality of channels such that modular rail can slide in the pair of the plurality of channels in the first direction until the pair of features can slide within the elongated channel in the second direction.

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1. An upper receiver for a weapon, the upper receiver comprising: a plurality channels located on top of an exterior surface of the upper receiver each of the plurality of channels being oriented in a first direction and wherein each of the plurality of channels intersect an elongated channel extend

1. An upper receiver for a weapon, the upper receiver comprising: a plurality channels located on top of an exterior surface of the upper receiver each of the plurality of channels being oriented in a first direction and wherein each of the plurality of channels intersect an elongated channel extending in a second direction, wherein the elongated channel is also located on top of the exterior surface of the upper receiver and between at least one flange of an upper ledge portion integrally formed in the exterior surface of the upper receiver and at least one flange of a lower ledge portion integrally formed in the exterior surface of the upper receiver; a modular rail having a pair of securement features configured to be slidably received within a pair of the plurality of channels such that modular rail can slide in the pair of the plurality of channels in the first direction until the pair of features can slide within the elongated channel in the second direction, wherein the pair of securement features are retained within the elongated channel by having a portion located behind the at least one flange of the upper ledge portion and in front of a surface of the elongated channel and by having another portion located behind a portion of the at least one flange of the lower ledge portion and in front of the surface of the elongated channel such that the pair of securement features cannot be removed from the elongated channel unless they are aligned with a pair of the plurality of channels such that the pair of securement features are no longer located behind the at least one flange of the upper ledge portion and the at least one flange of the lower ledge portion, wherein the plurality of channels and the elongated channel are formed in a hand guard that is integrally formed with the upper receiver. 2. The upper receiver as in claim 1, wherein the first direction is perpendicular to the second direction. 3. The upper receiver as in claim 1, wherein each of the pair of features further comprises a means for fixedly securing the modular rail to the upper receiver. 4. The upper receiver as in claim 1, wherein each of the pair of features engages the at least one flange of the upper ledge portion and the at least one flange of the lower edge portion defining the elongated channel when the modular rail is secured to the upper receiver. 5. The upper receiver as in claim 4, wherein each of the pair of features further comprises a means for fixedly securing the modular rail to the upper receiver and wherein the means further comprises a screw wherein a distal end of the screw is received within an opening in hand guard of the upper receiver when the modular rail is secured to the upper receiver. 6. The upper receiver as in claim 1 in combination with a weapon, wherein the weapon is an automatic or semi-automatic firearm. 7. An upper receiver for a weapon, the upper receiver comprising: a plurality channels each being oriented in a first direction on opposite exterior sides of the upper receiver and wherein each of the plurality of channels intersect an elongated channel extending in a second direction, wherein the plurality of channels and the elongated channel are formed in a hand guard that is integrally formed with the upper receiver, wherein the plurality of channels and the elongated channel are located on top of an exterior surface of the hand guard and between at least one flange of an upper ledge portion integrally formed in the exterior surface of the hand guard and at least one flange of a lower ledge portion integrally formed in the exterior surface of the hand guard; a plurality of modular rails each having a pair of securement features configured to be slidably received within a pair of the plurality of channels such that each of the plurality of modular rails can slide in the pair of the plurality of channels in the first direction until the pair of features can slide within the elongated channel in the second direction, wherein the pair of securement features are retained within the elongated channel by having a portion located behind the at least one flange of the upper ledge portion and in front of a surface of the elongated channel and by having another portion located behind a portion of the at least one flange of the lower ledge portion and in front of the surface of the elongated channel such that the pair of securement features cannot be removed from the elongated channel unless they are aligned with a pair of the plurality of channels such that the pair of securement features are no longer located behind the at least one flange of the upper ledge portion and the at least one flange of the lower ledge portion. 8. The upper receiver as in claim 7, further comprising a removable bottom portion, wherein the removable bottom portion has an integral rail. 9. The upper receiver as in claim 7, further comprising a removable bottom portion, wherein the removable bottom portion has a plurality channels each being oriented in a first direction and wherein each of the plurality of channels intersect an elongated channel extending in a second direction; and wherein each having a pair of securement features is configured to be slidably received within a pair of the plurality of channels of the removably bottom portion such that each of the plurality of modular rails can slide in the pair of the plurality of channels of the bottom portion in the first direction until the pair of features can slide within the elongated channel in the second direction. 10. The upper receiver as in claim 7, wherein the first direction is perpendicular to the second direction. 11. The upper receiver as in claim 7, wherein each of the pair of features further comprises a means for fixedly securing the modular rail to the upper receiver. 12. The upper receiver as in claim 7, wherein each of the pair of features engages the at least one flange of the upper ledge portion and the at least one flange of the lower edge portion defining the elongated channel when the modular rail is secured to the upper receiver. 13. The upper receiver as in claim 12, wherein each of the pair of features further comprises a means for fixedly securing the modular rail to the upper receiver and wherein the means further comprises a screw wherein a distal end of the screw is received within an opening in the hand guard of the upper receiver when the modular rail is secured to the upper receiver. 14. The upper receiver as in claim 7 in combination with a weapon, wherein the weapon is an automatic or semi-automatic firearm. 15. The upper receiver as in claim 1, wherein the elongated channel is located between a plurality of flanges, which define the upper ledge portion and the at least one flange of the lower edge portion, and wherein each one of the plurality of channels are located between a pair of the plurality of flanges which define the upper ledge portion. 16. The upper receiver as in claim 7, wherein the elongated channel is located between a plurality of flanges, which define the upper ledge portion and the at least one flange of the lower edge portion, and wherein each one of the plurality of channels are located between a pair of the plurality of flanges which define the upper ledge portion. 17. The upper receiver as in claim 15, wherein the plurality of channels, the elongated channel, the plurality of flanges, which define the upper ledge portion and the at least one flange of the lower edge portion are all formed on an integral one piece member of unitary construction. 18. The upper receiver as in claim 16, wherein the plurality of channels, the elongated channel, the plurality of flanges, which define the upper ledge portion and the at least one flange of the lower edge portion are all formed on an integral one piece member of unitary construction.