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US 11,629,925 B2Granted
Firearm bolt hold-open assembly and methods of use thereof
AssigneePDG, Inc.
InventorsPaul Wingrove, Douglas Norat
Life of this patent
Estimating the term…
Abstract
The inventive technology is directed to a bolt hold-open system configured to lock the bolt of an AK-47 firearm, or variants of the AK-47, in an open position after the last cartridge in a magazine has been ejected.
Claims18
A bolt hold-open system comprising:
- a block having a vertical slotted aperture positioned on the top surface of said block and removably mounted internally within a firearm receiver below a bolt assembly;
- a lifter assembly removably positioned within said vertical slotted aperture having:
- a top plate positioned beneath a bolt;
- a tubular shaft having a top end, a bottom end, and defining an internal spring housing that is open at the bottom end and closed at the top end by the top plate;
- a cross pin slot intersecting the spring housing;
- a spring internally positioned within said spring housing;
- wherein said lifter assembly is secured within said vertical slotted aperture by a cross pin inserted through a pin aperture on said block and said cross pin slot;
- wherein a spring-loaded magazine follower engages and exerts an upward force on said lifter assembly;
- and
- wherein the firing of the last round of a magazine generates an ejection force causing said bolt assembly to move rearward past said lifter assembly allowing said lifter assembly to extend upward and block a forward return motion of said bolt assembly.
7 more elements
A bolt hold-open assembly comprising:
- a firearm having a bolt assembly comprising a bolt and a bolt carrier;
- a block having a vertical slotted aperture positioned on the top surface of said block and mounted internally within a firearm receiver;
- a lifter assembly removably positioned within the vertical slotted aperture of said block having:
- a shaft forming an internal spring housing and a cross pin slot;
- a spring positioned with said spring housing;
- at least one bearing positioned adjacent to said spring;
- a top plate having a break tab and a bolt stop;
- a cross pin inserted through a pin aperture on said block and positioned within said cross pin slot adjacent to said bearing forming a tractable coupling;
- a coupler removably secured to a bottom end of the shaft and enclosing the spring and configured to allow insertion and removal of said spring from said spring housing;
- wherein a magazine follower that engages the break tab of said top plate after the last cartridge of a magazine has been chambered exerting an upward force on said top plate against the bottom of said bolt;
- and
- wherein firing of said last cartridge moves said bolt assembly rearward past said top plate allowing said top plate to extend upward blocking a forward return motion of said bolt assembly.
9 more elements
Dependencies are inferred from the claim text.