ABC IP LLC v. HK Parts

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Abc IP, LLC (Delaware) and RARE BREED TRIGGERS, INC. (Texas)
  • Defendant: HK PARTS INC. (Utah)
  • Plaintiff's Counsel: Parsons Behle & Latimer
• Case Identification: 2:26-cv-00090, D. Utah, 03/24/2026
• Venue Allegations: Venue is asserted based on the Defendant having a regular and established place of business within the District of Utah.
• Core Dispute: Plaintiffs allege that Defendant's aftermarket firearm trigger mechanisms, which provide a "forced reset" capability, infringe three patents related to selectable, multi-mode trigger systems.
• Technical Context: The technology at issue involves "forced reset triggers" for semi-automatic firearms, which use the energy of the firearm's cycle of operation to mechanically reset the trigger, enabling a faster rate of fire than is possible with a standard trigger mechanism.
• Key Procedural History: No prior litigation, Inter Partes Review (IPR) proceedings, or other significant procedural history is mentioned in the complaint.

Case Timeline

Date	Event
2021-11-05	U.S. Patent No. 12,031,784 Priority Date
2022-09-08	U.S. Patent No. 12,038,247 Priority Date
2022-09-08	U.S. Patent No. 12,578,159 Priority Date
2024-07-09	U.S. Patent No. 12,031,784 Issued
2024-07-16	U.S. Patent No. 12,038,247 Issued
2026-03-17	U.S. Patent No. 12,578,159 Issued
2026-03-24	Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 12,038,247 - "Firearm Trigger Mechanism," issued July 16, 2024

The Invention Explained

• Problem Addressed: The patent's background discusses the desire among firearm users to increase the rate of semi-automatic fire. It notes that standard trigger mechanisms, which rely on a user manually releasing the trigger to allow a disconnector to reset the hammer, limit this rate. Prior art methods like "bump firing" are also mentioned as a means to achieve this, implying a market desire for a more integrated solution. '247 Patent, col. 1:20-54
• The Patented Solution: The patent describes a trigger mechanism, often constructed as a "drop-in" module, that features a three-position selector: safe, standard semi-automatic, and forced reset semi-automatic. '247 Patent, col. 2:25-30 In the forced reset mode, a cam, which is pivoted by the reciprocating movement of the firearm's bolt carrier, actively pushes the trigger member back to its reset position. '247 Patent, col. 2:56-67 '247 Patent, abstract This mechanical reset allows the user to fire the next round without having to fully release and then pull the trigger again, enabling a more rapid firing sequence.
• Technical Importance: This invention provides a user-selectable, dual-mode firing capability, combining a conventional semi-automatic operation with an accelerated forced-reset function within a single, integrated firearm component. Compl. ¶19

Key Claims at a Glance

• The complaint asserts independent Claim 15, while reserving the right to assert other claims. Compl. ¶30
• The essential elements of independent Claim 15 include:
  • A firearm trigger mechanism comprising a hammer, a trigger member, a disconnector, and a cam with a cam lobe.
  • The cam is movable between a first position (for standard semi-automatic mode) and a second position (for forced reset semi-automatic mode).
  • In the standard mode, rearward movement of the bolt carrier resets the hammer, which is caught by the disconnector hook, requiring the user to manually release the trigger to fire again.
  • In the forced reset mode, the cam is in its second position, and its lobe forces the trigger member toward its set position.
  • In this forced reset mode, the rearward movement of the bolt carrier causes the hammer to pivot, but the disconnector hook is "prevented from catching" the hammer hook, allowing the user to immediately pull the trigger again to fire.

U.S. Patent No. 12,031,784 - "Adapted Forced Reset Trigger," issued July 9, 2024

The Invention Explained

• Problem Addressed: The patent background explains that forced reset triggers designed for one firearm platform (e.g., the AR-15) are often inoperable in others (e.g., the AR-10) due to differences in the dimensions and geometry of the bolt carrier and its position relative to the trigger components. '784 Patent, col. 1:20-44 Specifically, a locking member long enough to be actuated by an AR-10 bolt carrier would interfere with the bolt carrier's lower surface as it cycles rearward. '784 Patent, col. 1:40-44
• The Patented Solution: The invention is an extended trigger locking device featuring an upwardly extending "deflectable portion." '784 Patent, abstract This portion is long enough to make contact with the bolt carrier to unlock the trigger when the bolt is in battery. However, it is also "separately movable" or hinged, allowing it to fold or deflect out of the way as the front of the bolt carrier passes over it during its rearward cycle, thus avoiding interference. '784 Patent, col. 2:5-10 '784 Patent, Figs. 8-10
• Technical Importance: This design overcomes the geometric limitations of prior art, allowing a forced reset trigger mechanism to be adapted for use in multiple, varied semi-automatic firearm platforms beyond the standard AR-15. Compl. ¶20

Key Claims at a Glance

• The complaint asserts independent Claim 1, while reserving the right to assert other claims. Compl. ¶51
• The essential elements of independent Claim 1 include:
  • An extended trigger member locking device for a forced reset trigger mechanism.
  • The device comprises a "locking member" movable between a first position (where it locks the trigger) and a second position (where it does not).
  • Actuating contact with a bolt carrier causes the locking member to move from the first to the second position.
  • The locking member has a "body portion" that is movably supported.
  • The locking member also has an "upwardly extending deflectable portion" that is "separately movable relative to the body portion" between an extended and a deflected position.

U.S. Patent No. 12,578,159 - "Firearm Trigger Mechanism," issued March 17, 2026

Technology Synopsis

• The '159 Patent, a continuation of the application that led to the '247 Patent, describes a firearm trigger mechanism operable in both a standard semi-automatic mode and a second, forced reset semi-automatic mode. '159 Patent, Related U.S. Application Data Compl. ¶74 The mechanism uses a reciprocating bolt to cycle the action and a cam to force the trigger member toward its set position in the forced reset mode, enabling rapid firing. '159 Patent, abstract

Asserted Claims

• Independent Claim 1 is asserted. Compl. ¶72

Accused Features

• The complaint alleges that the dual-mode (standard and forced reset) functionality of the First and Second Infringing Devices embodies the technology claimed in the '159 Patent. Compl. ¶¶74-75

III. The Accused Instrumentality

Product Identification

• The complaint names the "Three-Position 'AR-15 Super Safety - Forced Reset Selector'" (the "First Infringing Device") and the "Three-Position 'ARC-Fire Trigger'" (the "Second Infringing Device"). Compl. ¶22 Compl. ¶26

Functionality and Market Context

• The accused instrumentalities are aftermarket components sold for installation in AR-15 and similar firearms. Compl. ¶36 Compl. ¶39 The complaint alleges these devices are designed to replace the firearm's factory safety selector and other fire control components to provide the user with three selectable operational modes: "safe, standard semiautomatic with disconnector, and forced reset semiautomatic with cam modes." Compl. ¶25 Compl. ¶28 The complaint includes a photograph of the First Infringing Device from Defendant's website, showing a selector switch assembly. Compl. ¶24 It also includes a photograph of the Second Infringing Device, which appears to be a more comprehensive trigger kit. Compl. ¶27 The complaint alleges these products are marketed for their ability to provide an accelerated rate of fire. Compl. ¶31 Compl. ¶39

IV. Analysis of Infringement Allegations

'247 Patent Infringement Allegations

Claim Element (from Independent Claim 15)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
A firearm trigger mechanism comprising:	The "Forced Reset Selector" is alleged to be part of a forced reset trigger mechanism that functions as a cam to force the reset of the trigger and lock it during the cycle of operation.	¶32	'247 Patent, abstract
a hammer having a sear catch and a hook for engaging a disconnector...	The accused device is installed with a hammer that allegedly has a sear catch and a hook for engaging a disconnector.	¶32	'247 Patent, col. 7:45-48
a trigger member having a sear...	The accused device is installed with a trigger member that allegedly has a sear.	¶32	'247 Patent, col. 7:50-53
said disconnector having a hook for engaging said hammer...	The accused device is installed with a disconnector that allegedly has a hook for engaging the hammer.	¶32	'247 Patent, col. 8:1-3
and a cam having a cam lobe and adapted to be movably mounted...	The accused Forced Reset Selector allegedly has a cam and lever (cam lobe) that is movably mounted in the fire control mechanism pocket.	¶32	'247 Patent, col. 8:5-7
said cam being movable between a first position and a second position...	The accused cam is alleged to be movable between a first and second position corresponding to the standard and forced reset modes.	¶32	'247 Patent, col. 8:40-44
in said second position said cam lobe forces said trigger member towards said set position,	In the forced reset mode (second position), the cam lobe allegedly forces the trigger member toward the set position.	¶32	'247 Patent, col. 9:48-51
whereupon in a standard semi-automatic mode...said disconnector hook catches said hammer hook,	In standard mode, rearward bolt movement allegedly causes the disconnector hook to catch the hammer hook, requiring manual release of the trigger.	¶32	'247 Patent, col. 9:13-19
whereupon in a forced reset semi-automatic mode...said disconnector hook is prevented from catching said hammer hook...	In forced reset mode, the cam allegedly forces the trigger to reset, and rearward bolt movement occurs such that the disconnector hook is prevented from catching the hammer hook.	¶32	'247 Patent, col. 9:35-41

• Identified Points of Contention:
  • Scope Questions: A central question may be the interpretation of the phrase "prevented from catching said hammer hook." The analysis will likely focus on whether the accused device's safety selector mechanism, in its "forced reset" position, achieves this "prevention" in the same way as contemplated by the patent, or if it operates via a different principle that falls outside the claim's scope.
  • Technical Questions: The complaint alleges the accused cam "forces" the trigger to reset. Compl. ¶32 A factual dispute could arise over the nature of this action. Evidence may be required to determine if the accused device's cam actively and completely drives the trigger to the set position, or if it merely assists a reset that is still dependent on other factors, such as the user reducing finger pressure. A plaintiff-generated rendering in the complaint illustrates the accused Forced Reset Selector (yellow) installed with a hammer (red), disconnector (orange), and trigger (brown). Compl. ¶32

'784 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
In a forced rest trigger mechanism, an extended trigger member locking device, comprising:	The accused Forced Reset Selector is alleged to be part of a forced reset trigger mechanism and to function as an extended trigger member locking device.	¶53	'784 Patent, claim 1
a locking member that is movable between a first position in which it locks a trigger against pulling movement and a second position where it does not restrict movement...	The accused device allegedly operates as a locking member movable between a first (locked) position and a second (unlocked) position.	¶53	'784 Patent, col. 3:9-12
such actuating contact [with a surface of a bolt carrier] causing the locking member to move from the first position to the second position,	Actuation by the bolt carrier allegedly causes the accused locking member to move from the locked to the unlocked position.	¶53	'784 Patent, col. 4:8-12
the locking member having a body portion that is movably supported	The accused device allegedly has a body portion that is movably supported by the firearm's lower receiver.	¶53	'784 Patent, col. 3:30-32
and an upwardly extending deflectable portion that is separately movable relative to the body portion between an extended position and a deflected position.	The accused device allegedly has an upwardly extending deflectable portion (lever arm) designed to allow separate movement relative to its body portion between an extended position and a deflected position.	¶53	'784 Patent, col. 3:39-44

• Identified Points of Contention:
  • Scope Questions: The dispute will likely center on the construction of "deflectable portion that is separately movable relative to the body portion." The question for the court will be whether this language requires two physically distinct components joined by a pivot, as depicted in the patent's primary embodiment, or if it can be read more broadly to cover a unitary but flexible component or other mechanisms that achieve a similar result.
  • Technical Questions: A key evidentiary question will be how the accused device's upward-extending arm actually functions when struck by the bolt carrier during its rearward cycle. Analysis will focus on whether this arm moves independently of the main body of the selector, as required by the "separately movable" limitation. A plaintiff-generated rendering shows the alleged total separate travel of the accused device's "upward extending deflectable portion," highlighting its movement independent of the body portion. Compl. ¶53

V. Key Claim Terms for Construction

For U.S. Patent No. 12,038,247

• The Term: "prevented from catching" (from Claim 15)
• Context and Importance: This term is critical because it defines the key difference between the claimed standard semi-automatic mode (where the disconnector does catch the hammer) and the forced reset mode (where it is "prevented" from doing so). The mechanism of this "prevention" is central to the infringement analysis. Practitioners may focus on this term because the defendant could argue its mechanism merely makes a catch unlikely or unnecessary rather than actively "preventing" it.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification states that in the forced reset mode, the safety selector "prevents the disconnector 60 from pivoting with the trigger member 38 thus preventing the disconnector hook 64 from catching the hammer hook 53." '247 Patent, col. 8:58-62 This could support a broad functional definition where any mechanism that stops the disconnector from engaging the hammer meets the limitation.
  • Evidence for a Narrower Interpretation: The specific embodiment shows a "narrow semi-circular portion 116" of the safety selector that physically blocks the disconnector's movement. '247 Patent, col. 8:55-60 '247 Patent, Fig. 6A This could support a narrower construction requiring direct physical obstruction by the safety selector, as opposed to another means of prevention.

For U.S. Patent No. 12,031,784

• The Term: "separately movable" (from Claim 1)
• Context and Importance: This term describes the novel feature of the locking member's upward extension, which allows it to fold out of the way of a reciprocating bolt carrier. Infringement hinges on whether the accused device's lever arm is "separately movable" from its main body. The definition will determine if the claim covers only pivoted, multi-piece constructions or also flexible, single-piece designs.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification suggests the feature can be a "hinging structure" but also contemplates that the extension "could be made from a resilient material configured to deflectably bend in one direction." '784 Patent, col. 3:25-29 '784 Patent, col. 3:49-53 This language suggests "separately movable" is a functional description that is not limited to a specific structure like a pin and hinge.
  • Evidence for a Narrower Interpretation: The primary embodiment illustrated in Figures 2-7 and 8-10 shows a distinct "extension portion" (22, 50) that pivots on a pin (24, 54) relative to the "locking bar body" (26, 52). '784 Patent, col. 3:39-44 A defendant might argue that the term "separately movable" should be limited to a construction with such distinct, mechanically joined parts, as this is the only structure fully enabled and described.

VI. Other Allegations

• Indirect Infringement: The complaint alleges both induced and contributory infringement. The inducement allegation is based on claims that the Defendant's website provides detailed instructions, compatibility lists, and installation videos that actively encourage and instruct customers to install and use the accused products in an infringing manner. (Compl. ¶34; Compl. ¶35; Compl. ¶36; Compl. ¶37; Compl. ¶38; Compl. ¶39; Compl. ¶40; Compl. ¶41). The contributory infringement allegation is based on the assertion that the accused components are specially designed for use in the patented trigger mechanism and are not suitable for substantial non-infringing uses. Compl. ¶42 Compl. ¶63 Compl. ¶84
• Willful Infringement: The complaint alleges that the Defendant's infringement is willful, asserting on information and belief that Defendant "has known or should have known" that its actions constitute infringement and that it "could not reasonably or subjectively believe" that it was not infringing or that the patents were invalid. Compl. ¶43 Compl. ¶64 Compl. ¶85 The allegations are based on asserted knowledge of the patents and the objective likelihood of infringement.

VII. Analyst's Conclusion: Key Questions for the Case

• A core issue will be one of functional interpretation: For the '247 and '159 patents, does the accused mechanism operate in the specific sequence claimed? Specifically, does the safety selector "prevent" the disconnector from catching the hammer in the forced reset mode, and does the cam "force" the trigger to reset, or is there a functional difference that places the accused products outside the scope of the claims?
• A central question will be one of claim construction: For the '784 patent, the case will likely turn on the definition of "separately movable." Can this term, rooted in a described embodiment with a distinct pivot pin, be construed to cover the specific design of the accused devices' upward-extending lever, or does the accused design fall outside this key limitation?
• A significant factor will be the evidence of intent for inducement: Given that the accused products are components for user assembly, the strength of the inducement claim will be critical. The court will likely examine the defendant's marketing materials, compatibility charts, and installation videos, which are extensively cited in the complaint, to determine if they establish the requisite intent to encourage direct infringement by end-users. Compl. ¶¶34-41