Means for converting semi-automatic firearm to pump-action rifle
OwnerDouglas Martin Hooninventor
Life of this patent
Estimating the term…
Abstract
The invention comprises various minimal modifications to the upper receiver assembly of an AR-platform semiautomatic firearm whereby the firearm is reversibly converted to a pump-action firearm. The modifications comprise a means to introduce a push rod which passes through the front end of the upper receiver and connects a pump hand grip and the bolt carrier group of the firearm. The pump hand grip is guided and supported by the barrel and by a secondary guide rail disposed above the barrel.
Claims16
A firearm comprising:
- a lower receiver assembly;
- and
- an upper receiver assembly;
- wherein the low receiver assembly is an unmodified assembly capable of being used on semi-automatic AR-platform rifles and the upper receiver assembly is modified from a standard upper receiver assembly capable of being used on semi-automatic AR-platform rifles only by:
- removal of the hand guard;
- removal of the gas tube;
- removal of the gas block;
- removal of the bolt carrier key;
- and
- the addition of a manually operated pump-action reload mechanism,
- wherein the pump-action reload mechanism comprises:
- a push rod sized in diameter to slideingly pass through a hole in the front of the upper receiver;
- a bolt carrier key joined to the push rod;
- a modified gas block;
- an aft guide rail support;
- a pump hand grip connected lo the push rod. and
- a guide rail assembly;
- wherein the pump hand grip comprises a generally cylindrical body with a hollow cylindrical cavity disposed parallel to the cylindrical axis of the pump grip body and extending through the full length of the pump hand grip, the hollow cavity is disposed concentrically around the barrel, and the hollow cavity is sized to allow the pump hand grip to slide axially along the barrel;
- and
- wherein the guide rail assembly is fixedly attached to the modified gas block on the forward end of the guide rail and to the aft guide rail support on the aft end of the guide rail and engages with the pump hand grip to prevent its rotation around the barrel, and wherein the aft guide rail support is fixedly attached to the barrel
A kit of parts that allows an owner to quickly and easily convert a semi-automatic AR-platform rifle to a pump-action rifle wherein the kit of parts includes:
- a pump hand grip;
- a push rod;
- a bolt carrier joined to the push rod;
- at least one of
- a turnbuckle nut,
- at least one threaded fastener
- for attaching the push rod to the pump hand grip;
- a guide rail;
- a modified gas block;
- and
- an aft support.
The kit of claim 11 wherein the kit further comprises special tooling for enlarging the gas tube hole in the from of the upper receiver.
A system for converting a semiautomatic AR-platform rifle having an upper receiver assembly including a barrel and a bolt carrier to a pump-action rifle;
- comprising:
- a guide rail mounted along an axis parallel with the barrel and comprising a slot for receiving and guiding a pump hand grip;
- a pump hand grip coaxially and slidably received by the barrel, said pump hand grip including a rectangular protrusion received by the slot in the guide rail to prevent rotation of said pump hand grip relative to the barrel;
- and
- a push rod which connects the pump hand grip with the bolt carrier.
Dependencies are inferred from the claim text.