IP Library › Granted Patent US 12,687,355
Granted Patent B2
US 12,687,355 · App. 19/064,817 · Granted Jul 21, 2026

Firearm with integrated lower receiver components

Inventor: Jason Kiyoshi Brown (Chantilly, VA)
Assignee: XCAL IP LLC
F41A3/66F41A17/36
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Quick Facts
Patent No.
US 12,687,355
App. No.
19/064,817
Granted
Jul 21, 2026
Kind
B2
Abstract

Firearms with integrated lower receiver components have a bolt hold open element movably connected to a frame to the rear of a magazine well and configured to move between a protruding position operable to restrain a bolt assembly rearward of the magazine well, and a retracted position operable to enable the bolt assembly to move forward beyond a rear portion of the magazine well, an elongated link connected to the bolt hold open element, a forward portion of the elongated link extending forward of the magazine well and having an actuator portion extending above the magazine well and configured to be actuated by a magazine follower, the elongated link having a first elongated portion received by the frame to rotate, the elongated link having an arm extending laterally from the first elongated portion and having a free end movable between an elevated and lowered position and including the actuator portion.

Claims (47)

1 . A firearm comprising:

a frame having a barrel extending in a forward direction and defining a bolt passage configured to receive a reciprocating bolt assembly;

the frame defining a magazine well;

a bolt hold open element movably connected to the frame to the rear of the magazine well and configured to move between a protruding position operable to restrain the reciprocating bolt assembly rearward of the magazine well, and a retracted position operable to enable the reciprocating bolt assembly to move forward beyond a rear portion of the magazine well;

an elongated link connected to the bolt hold open element;

a forward portion of the elongated link extending forward of the magazine well and having an actuator portion extending above the magazine well and configured to be actuated by a magazine follower;

the elongated link having a first elongated portion defining a link axis and received by the frame to rotate about the link axis;

the elongated link having an arm extending laterally from the first elongated portion and having a free end movable between an elevated and lowered position;

the free end of the arm including the actuator portion;

wherein the frame includes a feed ramp element at a forward portion of the magazine well; and

wherein the feed ramp element defines an aperture receiving the actuator portion of the elongated link.

2 . The firearm of claim 1 wherein the elongated link is a rod having a circular cross-sectional profile.

3 . The firearm of claim 2 wherein the entire elongated link has a circular cross-sectional profile.

4 . The firearm of claim 2 wherein the rod extends to the actuator portion.

5 . The firearm of claim 1 wherein the frame has a left side and a right side, and wherein the first elongated portion is left of the magazine well, and the actuator portion is above a right portion of the magazine well.

6 . The firearm of claim 1 wherein the magazine well has a width, and the arm has a length at least ¾ of the width of the magazine well.

7 . The firearm of claim 1 wherein the magazine well has a width, and the arm extends the width of the magazine well.

8 . The firearm of claim 1 wherein the elongated link includes a third portion extending rearward from the arm.

9 . A firearm comprising:

a frame having a barrel extending in a forward direction and defining a bolt passage configured to receive a reciprocating bolt assembly;

the frame defining a magazine well;

a bolt hold open element movably connected to the frame to the rear of the magazine well and configured to move between a protruding position operable to restrain the reciprocating bolt assembly rearward of the magazine well, and a retracted position operable to enable the reciprocating bolt assembly to move forward beyond a rear portion of the magazine well;

an elongated link connected to the bolt hold open element;

a forward portion of the elongated link extending forward of the magazine well and having an actuator portion extending above the magazine well and configured to be actuated by a magazine follower;

the elongated link having a first elongated portion defining a link axis and received by the frame to rotate about the link axis;

the elongated link having an arm extending laterally from the first elongated portion and having a free end movable between an elevated and lowered position;

the free end of the arm including the actuator portion;

wherein the elongated link is a rod having a circular cross-sectional profile; and

wherein the entire elongated link has a circular cross-sectional profile.

10 . A firearm comprising:

a frame having a barrel extending in a forward direction and defining a bolt passage configured to receive a reciprocating bolt assembly;

the frame defining a magazine well;

a bolt hold open element movably connected to the frame to the rear of the magazine well and configured to move between a protruding position operable to restrain the reciprocating bolt assembly rearward of the magazine well, and a retracted position operable to enable the reciprocating bolt assembly to move forward beyond a rear portion of the magazine well;

an elongated link connected to the bolt hold open element;

a forward portion of the elongated link extending forward of the magazine well and having an actuator portion extending above the magazine well and configured to be actuated by a magazine follower;

the elongated link having a first elongated portion defining a link axis and received by the frame to rotate about the link axis, the first elongated portion being constrained without relative movement with respect to the frame other than rotation;

the elongated link having an arm extending laterally from the first elongated portion and having a free end movable between an elevated and lowered position;

the free end of the arm including the actuator portion; and

wherein the frame has a left side and a right side, and wherein the first elongated portion is left of the magazine well, and the actuator portion is above a right portion of the magazine well.

11 . The firearm of claim 10 wherein the elongated link is a rod having a circular cross-sectional profile.

12 . The firearm of claim 11 wherein the entire elongated link has a circular cross-sectional profile.

13 . The firearm of claim 11 wherein the rod extends to the actuator portion.

14 . The firearm of claim 10 wherein the frame includes a feed ramp element at a forward portion of the magazine well.

15 . The firearm of claim 14 wherein the feed ramp element defines an aperture receiving the actuator portion of the elongated link.

16 . The firearm of claim 10 wherein the magazine well has a width, and the arm has a length at least ¾ of the width of the magazine well.

17 . The firearm of claim 10 wherein the magazine well has a width, and the arm extends the width of the magazine well.

18 . The firearm of claim 10 wherein the elongated link includes a third portion extending rearward from the arm.