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US 2019/0195581 A1Published application
Firearm with locked breech rotating bolt pistol
OwnerCharles B. Casselsinventor
Life of this patent
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Abstract
A locked breech rotating bolt pistol caliber operating system for use with a semi-automatic or fully automatic firearms is described that is retro fit capable and is compatible with many existing AR15 type lower receivers that utilize pistol caliber magazines. The operating system includes an upper receiver that includes a fixed ejector to eject spent casings to minimize the likelihood that the firearm will jam.
Claims27
A firearm comprising:
- an upper receiver including an internal wall defining a bore and an ejection port communicating with the bore;
- a bolt carrier assembly including a bolt carrier and a bolt, the bolt carrier assembly being movable within the bore of the upper receiver between rearward-most and forward-most positions, the bolt being supported on the bolt carrier for axial and rotatable movement in relation to the bolt carrier, the bolt having a forward end including one or more first locking lugs;
- one or more second locking lugs supported on the upper receiver adjacent a forward end of the receiver, wherein the bolt is rotatable in relation to the bolt carrier from an unlocked position to a locked position in which the one or more first locking lugs are interlocked with the one or more second locking lugs;
- and
- an ejector fixedly supported within the bore of the upper receiver, the ejector having an angled forward face that is positioned to eject spent casings towards the ejection port of the upper receiver.
2 more elements
A bolt carrier assembly comprising:
- a bolt carrier and a bolt, the bolt being supported on the bolt carrier for axial and rotatable movement in relation to the bolt carrier, the bolt having a feed lug and a forward end including one or more locking lugs, wherein the feed lug includes a forward surface and a tapered rear surface, the forward surface being positioned to strip an upper most round of ammunition from a pistol caliber magazine of a firearm, the tapered rear surface being positioned to engage and pass over the upper most round of ammunition during rearward movement of the bolt within the bore of the upper receiver, wherein the bolt carrier defines a longitudinal axis and the tapered rear surface of the feed lug defines an angle β with the longitudinal axis, wherein β is between 15 degrees and 45 degrees.
Dependencies are inferred from the claim text.