Automatic/semi-automatic rifle assembly for large caliber belted cartridges
DCFirst Claim
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1. An automatic or semi-automatic firearm assembly configured for firing a belted cartridge, the firearm assembly comprising:
- a gas operating system for automatic action cycling;
an upper receiver assembly configured for receiving magazine-fed belted cartridges and for ejecting spent cartridge casings through an ejection port;
an elongate firing pin defining a central axis;
an elongate bolt carrier having a central bore, a posterior end configured to interface the firing pin, and an anterior end configured to interface a bolt assembly partially disposed within the central bore, the bolt assembly operative with the firing pin and including a bolt and a bolt extractor;
a bushing configured to interface the bolt carrier and limit travel rearward of the bolt carrier during automatic action cycling;
a charging handle inserted into a distal end of the upper receiver assembly above the central axis, the charging handle slidable parallel to the central axis into the upper receiver assembly; and
a barrel chamber having anterior and posterior ends for receiving the belted cartridge, the barrel chamber having a wall thickness between about 0.250 to 0.350 inches, wherein the barrel chamber includes a counter bore at its posterior end to interface the belted portion of the belted cartridge, and wherein the charging handle is configured to engage the bolt assembly for manual action cycling to position an initial belted cartridge within the barrel chamber.
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Abstract
Embodiments of the present disclosure provide modifications to the AR platform operating system such that the platform now is competent to fire large caliber cartridges, including belted cartridges, providing longer range and greater barrier penetration without substantially altering the characteristic features and component inter-relationships of this platform.
49 Citations
32 Claims
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1. An automatic or semi-automatic firearm assembly configured for firing a belted cartridge, the firearm assembly comprising:
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a gas operating system for automatic action cycling; an upper receiver assembly configured for receiving magazine-fed belted cartridges and for ejecting spent cartridge casings through an ejection port; an elongate firing pin defining a central axis; an elongate bolt carrier having a central bore, a posterior end configured to interface the firing pin, and an anterior end configured to interface a bolt assembly partially disposed within the central bore, the bolt assembly operative with the firing pin and including a bolt and a bolt extractor; a bushing configured to interface the bolt carrier and limit travel rearward of the bolt carrier during automatic action cycling; a charging handle inserted into a distal end of the upper receiver assembly above the central axis, the charging handle slidable parallel to the central axis into the upper receiver assembly; and a barrel chamber having anterior and posterior ends for receiving the belted cartridge, the barrel chamber having a wall thickness between about 0.250 to 0.350 inches, wherein the barrel chamber includes a counter bore at its posterior end to interface the belted portion of the belted cartridge, and wherein the charging handle is configured to engage the bolt assembly for manual action cycling to position an initial belted cartridge within the barrel chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An automatic or semi-automatic firearm assembly configured for firing a belted cartridge, the firearm assembly comprising:
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a gas operating system for automatic action cycling; an upper receiver assembly configured for receiving magazine-fed belted cartridges and for ejecting spent cartridge casings through an ejection port; an elongate firing pin defining a central axis; an elongate bolt carrier having a central bore, a posterior end configured to interface the firing pin, and an anterior end configured to interface a bolt assembly partially disposed within the central bore, the bolt assembly operative with the firing pin and including a bolt and a bolt extractor, the bolt carrier further comprising; an upper relief cut aperture through an outer surface of the bolt carrier, the upper relief cut aperture extending along the elongate bolt carrier from a first position intermediate along a length of the bolt carrier, to a second position located at a distance from the posterior end; and a lower relief cut aperture through the outer surface of the bolt carrier, the lower relief cut aperture extending along the elongate bolt carrier from a third position nearer the anterior end than the first position, to a fourth position located at the distance from the posterior end, such that the lower relief cut aperture is longer than the upper relief cut aperture; a bushing configured to interface the bolt carrier and limit travel rearward of the bolt carrier during automatic action cycling; a charging handle inserted into a distal end of the upper receiver assembly above the central axis, the charging handle slidable parallel to the central axis into the upper receiver assembly; and a barrel chamber having anterior and posterior ends for receiving the belted cartridge, the barrel chamber having a wall thickness between about 0.250 to 0.350 inches, wherein the barrel chamber includes a counter bore at its posterior end to interface the belted portion of the belted cartridge, wherein the charging handle is configured to engage the bolt assembly for manual action cycling to position an initial belted cartridge within the barrel chamber, and wherein the overall length of the ejection port is between about 3.4 inches and about 4.5 inches. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification