Monolithic rail platform and bolt assemblies for a firearm
AssigneeKarl R. Lewis
InventorsKarl R. Lewis, James Arend Seabold Bargren, Jacob A. Schafer, Neal David Hohl
Life of this patent
Estimating the term…
Abstract
A firearm assembly for a firearm can include a monolithic rail platform with a handguard portion and an upper receiver portion. The barrel of the firearm can be positioned through the handguard portion and secured with the upper receiver portion. A firearm assembly can also include a bolt assembly with a bolt carrier having minimized land area and a forward end sized for receipt in the barrel extension at the rearward end of the barrel.
Claims54
A monolithic rail platform for a firearm that includes a barrel assembly, the monolithic rail platform comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly of the firearm therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion, said upper receiver portion adapted to receive a bolt carrier therein;
- a continuous upper rail extending rearwardly along said handguard portion and said upper receiver portion;
- and
- a coupling portion at a forward end of said upper receiver portion and integral with said handguard portion, said coupling portion adapted to releasable clamp a rearward end of the barrel assembly extending through said handguard portion to said upper receiver portion, wherein said upper receiver, said handguard portion and said coupling portion are integrally unitarily constructed.
A monolithic rail platform for a rotating bolt type firearm that includes a barrel assembly, the monolithic rail platform comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly of the rotating bolt type firearm therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion, said upper receiver portion adapted to receive a bolt carrier therein;
- and
- a contiguous upper rail extending rearwardly along said handguard portion and said upper receiver portion.
A monolithic rail platform for a firearm that includes a barrel assembly and a barrel extension with a barrel extension bore, the monolithic rail platform comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly of the firearm therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion;
- a longitudinal bore extending through said upper receiver portion;
- and
- a bolt assembly movably positioned in said longitudinal bore, the bolt assembly including a bolt carrier having a protrusion at a forward end of a bolt receiving portion of the bolt carrier, the protrusion being sized for receipt in the barrel extension bore when the monolithic rail platform is part of the firearm thereby increasing a stroke length of the bolt carrier in a longitudinal bore of said upper receiver portion to increase a dwell time of a bolt by up to approximately twice that provided by bolt carriers without the protrusion, wherein a first inner diameter of the bolt receiving portion is substantially equal to a second inner diameter of the protrusion.
A monolithic rail platform for a rotating bolt type firearm that includes a barrel assembly, the monolithic rail platform comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly of the rotating bolt type firearm therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion;
- a longitudinal bore extending through said upper receiver portion;
- and
- a bolt assembly movably positioned in said longitudinal bore, the bolt assembly including a bolt carrier including a forward end portion and a rearward end portion, the forward end portion including a number of lands extending therealong and spaced thereabout, the number of lands occupying from about 1% to about 12% of a surface area of the forward end portion along which the number of lands extend.
A monolithic rail platform for a rotating bolt type firearm that includes a barrel assembly, comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly of the rotating bolt type firearm therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion;
- a bolt carrier received in said upper receiver portion;
- a longitudinal bore extending through said upper receiver portion;
- and
- a protrusion at a forward end of a bolt receiving portion of the bolt carrier, the protrusion being sized for receipt in the barrel assembly thereby increasing a stroke length of the bolt carrier in said longitudinal bore of said upper receiver portion by approximately one hundred thousandths of an inch for an rotating bolt type rifle, wherein a first inner diameter of the bolt receiving portion is substantially equal to a second inner diameter of the protrusion.
A monolithic platform for a firearm that includes a barrel assembly, the platform comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly of the firearm therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion, said upper receiver portion adapted to receive a bolt carrier therein;
- and
- a coupling portion between said handguard portion and said upper receiver portion, said coupling portion including a longitudinal slot separating said coupling portion into first and second clamping portions on respective sides of said slot, wherein said first and second clamping portions are constructed and arranged such that a fastener positioned through said coupling portion transversely to said longitudinal slot is operable to bring said first and second clamping portions toward one another to clamp the barrel assembly in said coupling portion and wherein the fastener is positionable in a recess in an outer surface of the barrel assembly to resist forward movement of the barrel assembly.
A monolithic rail platform for a use with an M16 lower receiver and a barrel assembly, the monolithic rail comprising:
- a handguard portion adapted to receive at least a portion of the barrel assembly therein;
- an upper receiver portion extending rearwardly from and integrally formed with said handguard portion, wherein said upper receiver portion is constructed and arranged to receive an M16 lower receiver;
- a contiguous upper rail extending across said handguard portion and said upper receiver portion.
Dependencies are inferred from the claim text.