ABC IP LLC v. 2a Ninja LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: ABC IP, LLC (Delaware); Rare Breed Triggers, Inc. (Texas)
  • Defendant: 2A Ninja LLC (Missouri); Ethan Alexander Cook (Missouri)
  • Plaintiff's Counsel: Stinson LLP
• Case Identification: 4:26-cv-00854, E.D. Mo., 05/29/2026
• Venue Allegations: Venue is alleged to be proper as all Defendants reside in the district and/or have a regular and established place of business in the district.
• Core Dispute: Plaintiffs allege that Defendants' "Disruptor" forced reset trigger assembly infringes five patents related to firearm trigger mechanisms.
• Technical Context: The technology domain is firearm trigger mechanisms, specifically "forced reset triggers" for AR-15 pattern firearms, which are designed to increase the potential rate of semi-automatic fire.
• Key Procedural History: The complaint alleges that the manufacturer of the accused device maintains a website with an "FRT Legal Library" that includes links to several of the asserted patents, which Plaintiffs use as a basis for alleging pre-suit knowledge and willful infringement.

Case Timeline

Date	Event
2017-09-29	'223 Patent Priority Date
2019-12-24	'223 Patent Issue Date
2022-01-10	'003, '336, '807, '403 Patents Priority Date
2023-08-15	'003 Patent Issue Date
2024-07-16	'336 Patent Issue Date
2025-04-15	'807 Patent Issue Date
2026-05-26	'403 Patent Issue Date
2026-05-29	Complaint Filing Date

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

U.S. Patent No. 10,514,223 - "Firearm Trigger Mechanism"

• Patent Identification: U.S. Patent No. 10,514,223, "Firearm Trigger Mechanism," issued December 24, 2019.

The Invention Explained

• Problem Addressed: In a standard semi-automatic firearm, the speed at which a user can fire is limited by their ability to manually release and reset the trigger after each shot, which prevents the firearm from firing multiple rounds on a single pull '223 Patent, col. 1:26-40 Compl. ¶19
• The Patented Solution: The invention is a "forced reset trigger" mechanism where the rearward movement of the firearm's bolt carrier, as it cycles, makes contact with the trigger member and mechanically forces it back to the "set" position '223 Patent, col. 5:31-37 A separate, spring-biased "locking bar" blocks the trigger from being pulled again until the bolt carrier has returned to a safe, in-battery position, preventing "hammer follow" '223 Patent, abstract Compl. ¶21
• Technical Importance: This design allows for a significantly increased rate of semi-automatic fire by automating the trigger reset, making it dependent on the firearm's mechanical cycle speed rather than the user's finger speed '223 Patent, col. 2:2-15

Key Claims at a Glance

• The complaint asserts independent claim 4 Compl. ¶37
• The essential elements of claim 4 include:
  • A housing with openings for hammer and trigger pins.
  • A hammer with a sear notch, pivotable between set and released positions.
  • A trigger member with a sear, also pivotable between set and released positions.
  • The trigger member has a surface positioned to be contacted by the hammer when displaced by the bolt carrier, with this contact "causing the trigger member to be forced to the set position."
  • A locking bar, pivotally mounted in the housing, that is spring-biased to a first position where it "mechanically blocks the trigger member."
  • The locking bar is movable to a second position when contacted by the bolt carrier reaching an "in-battery position," allowing the trigger to be moved by an external force.
• The complaint reserves the right to assert other claims, including under the doctrine of equivalents Compl. ¶37

U.S. Patent No. 11,724,003 - "Firearm Trigger Mechanism"

• Patent Identification: U.S. Patent No. 11,724,003, "Firearm Trigger Mechanism," issued August 15, 2023.

The Invention Explained

• Problem Addressed: The patent background notes a desire for "further improvement in forced reset triggers" beyond prior designs '003 Patent, col. 2:22-23 The complaint clarifies this involves adding user-selectable modes Compl. ¶22
• The Patented Solution: This patent builds on the forced reset concept by adding a "three position" safety selector that allows the user to choose between "safe, standard semi-automatic, and forced reset semi-automatic positions" '003 Patent, abstract In the "forced reset" mode, the selector prevents the disconnector from catching the hammer, enabling the forced reset cycle. In "standard" mode, the disconnector functions normally, requiring a manual trigger release and reset by the user '003 Patent, col. 9:10-34
• Technical Importance: This innovation provides the operator with the versatility to switch between a conventional semi-automatic trigger feel and an enhanced, rapid-fire forced reset capability within a single trigger assembly.

Key Claims at a Glance

• The complaint asserts independent claim 4 Compl. ¶51
• The essential elements of claim 4 are extensive and build upon the '223 Patent's concepts, adding:
  • A disconnector with a hook for engaging the hammer.
  • A safety selector adapted to pivot between "safe, standard semi-automatic, and forced reset semi-automatic positions."
  • A "whereupon" clause describing the function in "standard semi-automatic position," where the disconnector hook catches the hammer hook and the user must manually release the trigger.
  • A "whereupon" clause describing the function in "forced reset semi-automatic position," where the safety selector prevents the disconnector hook from catching the hammer hook, allowing for a forced reset without a manual trigger release.
• The complaint reserves the right to assert other claims, including under the doctrine of equivalents Compl. ¶51

U.S. Patent No. 12,036,336 - "Firearm Trigger Mechanism"

• Patent Identification: U.S. Patent No. 12,036,336, "Firearm Trigger Mechanism," issued July 16, 2024.
• Technology Synopsis: This patent describes a firearm trigger mechanism with selectable modes of operation. It details the interaction between a safety selector, a disconnector, a hammer, and a trigger member to provide both a standard semi-automatic mode and a forced reset semi-automatic mode, wherein the selector's position determines whether the disconnector engages the hammer during the firing cycle '336 Patent, abstract
• Asserted Claims: The complaint asserts independent claim 3 Compl. ¶65
• Accused Features: The allegations target the "Disruptor" trigger's functionality of allowing a user to switch between a standard semi-automatic mode and a forced reset mode using its safety selector Compl. ¶27 Compl. ¶67

U.S. Patent No. 12,274,807 - "Firearm Trigger Mechanism"

• Patent Identification: U.S. Patent No. 12,274,807, "Firearm Trigger Mechanism," issued April 15, 2025.
• Technology Synopsis: This patent claims a trigger mechanism for an AR-pattern firearm featuring a hammer, trigger member, disconnector, locking member, and a three-position safety selector. The invention focuses on the interplay of these components to enable distinct standard semi-automatic and forced reset semi-automatic operational modes, governed by the position of the safety selector '807 Patent, abstract
• Asserted Claims: The complaint asserts independent claim 1 Compl. ¶79
• Accused Features: The infringement allegations focus on the "Disruptor" trigger's complete assembly and its operation in both standard and forced reset modes, as enabled by its multi-position safety selector Compl. ¶27 Compl. ¶81

U.S. Patent No. 12,636,403 - "Firearm Trigger Mechanism"

• Patent Identification: U.S. Patent No. 12,636,403, "Firearm Trigger Mechanism," issued May 26, 2026.
• Technology Synopsis: This patent describes a forced reset trigger mechanism with a safety selector movable between a standard semi-automatic position and a forced reset position. It specifies the mechanical interactions where, in the standard mode, the user must reduce trigger pressure to fire again, while in the forced reset mode, rearward pressure is not required to be reduced for a subsequent shot '403 Patent, col. 17:39-66
• Asserted Claims: The complaint asserts independent claim 38 Compl. ¶93
• Accused Features: The allegations target the "Disruptor" trigger's implementation of a selectable standard semi-automatic mode and a forced reset mode Compl. ¶27 Compl. ¶95

III. The Accused Instrumentality

• Product Identification: The accused instrumentality is a forced reset trigger assembly known as the "Disruptor" Compl. ¶24
• Functionality and Market Context: The complaint alleges the Disruptor is a trigger assembly for AR-pattern firearms that includes a three-position safety selector Compl. ¶24 This selector allows the user to switch between a "safe" position, a "standard semiautomatic with disconnector" mode, and a "forced reset semiautomatic" mode Compl. ¶27 In the forced reset mode, the cycling of the firearm's action "causes hammer contact with the trigger member to forcefully reset the hammer and trigger member," while a locking bar prevents firing until the bolt carrier is in battery Compl. ¶28 The complaint alleges Defendants sell the Disruptor through the "2A Ninja website" both as a standalone product and pre-installed in firearms Compl. ¶25 A screenshot provided in the complaint shows the "Partisan Disruptor 3 Position FRT" for sale on the 2A Ninja website Compl. ¶26

IV. Analysis of Infringement Allegations

'223 Patent Infringement Allegations

Claim Element (from Independent Claim 4)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a housing having transversely aligned pairs of openings for receiving hammer and trigger assembly pins;	The Disruptor includes a housing with openings for hammer and trigger pins.	¶39	col. 4:3-12
a hammer having a sear notch and mounted in the housing to pivot on a transverse axis between set and released positions;	The Disruptor's hammer (depicted in blue) has a sear notch and is mounted in the housing to pivot.	¶39	col. 4:13-28
a trigger member having a sear and mounted in the housing to pivot on a transverse axis between set and released positions,	The Disruptor's trigger member (depicted in green) has a sear and is mounted in the housing to pivot.	¶39	col. 4:51-61
the trigger member having a surface positioned to be contacted by the hammer when the hammer is displaced by the bolt carrier when cycled, the contact causing the trigger member to be forced to the set position;	The cycling of the bolt carrier causes the hammer to pivot and contact a surface on the trigger member, forcing the trigger to the set position. The complaint provides a color-coded rendering illustrating the contact between the "Hammer Surface" and "Trigger Surface" Compl. ¶39	¶39	col. 5:31-37
a locking bar pivotally mounted in the housing and spring biased toward a first position in which the locking bar mechanically blocks the trigger member from moving to the released position,	The Disruptor includes a locking bar (depicted in red) that is pivotally mounted and spring-biased to a position where it blocks the trigger member.	¶39	col. 4:62-68
and movable against the spring bias to a second position when contacted by the bolt carrier reaching a substantially in-battery position in which the trigger member can be moved by an external force to the released position.	When contacted by the bolt carrier, the locking bar moves to a second position, allowing the trigger to be pulled by the user.	¶39	col. 5:55-68

• Identified Points of Contention:
  • Scope Questions: The term "forced to the set position" is central. A potential dispute may arise over whether the specific mechanical interaction in the accused Disruptor constitutes being "forced" in the manner contemplated by the patent, or if it achieves reset through a technically distinct means that falls outside the claim's scope.
  • Technical Questions: The complaint's infringement theory relies on plaintiff-generated, color-coded diagrams to show the interaction of parts Compl. ¶39 A key question for the court will be whether discovery and expert testimony can substantiate that the physical Disruptor product actually operates with the precise sequence of contacts, blocking, and forcing actions as alleged and as required by the claim language.

'003 Patent Infringement Allegations

Claim Element (from Independent Claim 4)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a safety selector adapted to be mounted in a fire control mechanism pocket of a receiver to pivot between safe, standard semi-automatic, and forced reset semi-automatic positions,	The Disruptor includes a safety selector that pivots between safe, standard, and forced reset positions. A product photo shows the selector switch Compl. ¶53	¶53	col. 9:10-21
whereupon in said standard semi-automatic position, rearward movement of the bolt carrier causes rearward pivoting of said hammer such that said disconnector hook catches said hammer hook, at which time a user must manually release said trigger member...	In standard mode, the Disruptor's disconnector (orange) allegedly catches the hammer hook, requiring the user to release the trigger to reset.	¶53	col. 9:35-51
and whereupon in said forced reset semi-automatic position, rearward movement of the bolt carrier causes rearward pivoting of said hammer causing said trigger member to be forced to said set position, said safety selector preventing said disconnector hook from catching said hammer hook...	In forced reset mode, the Disruptor's safety selector allegedly prevents the disconnector from catching the hammer, allowing the cycle to forcibly reset the trigger without a manual release from the user.	¶53	col. 10:1-26

• Identified Points of Contention:
  • Scope Questions: Claim 4 of the '003 patent is highly detailed, with long "whereupon" clauses describing the precise function in each selectable mode. A defense may question whether the accused Disruptor's "standard" mode is identical to a conventional AR-15 trigger mechanism or if it functions in a way that differs from the specific claim description.
  • Technical Questions: The allegation that the safety selector "prevent[s] the disconnector hook from catching said hammer hook" is a critical technical assertion. The complaint supports this with diagrams Compl. ¶53, but the case may turn on factual evidence of how the selector cam surface interacts with the disconnector in the physical product to achieve this specific function.

V. Key Claim Terms for Construction

For the '223 Patent and '003 Patent

• The Term: "forced to the set position"

• Context and Importance: This phrase is the technological core of the "forced reset" invention. The definition of "forced" will determine whether any mechanical interaction that results in a reset infringes, or if only a specific type of direct, unyielding displacement is covered. Practitioners may focus on this term because the precise nature of the contact between the hammer and trigger during the reset cycle is a complex mechanical interaction that could be a point of non-infringement if the accused device uses a different method.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification states that "contact between a rear surface... of the hammer... and a contact surface... of the trigger member... forces the trigger to pivot... to its reset position" '223 Patent, col. 5:32-37 This general language could support an interpretation covering any reset action caused by hammer-trigger contact.
  • Evidence for a Narrower Interpretation: The figures, particularly Figure 5 of the '223 patent, depict a direct, rigid push from the tail of the hammer onto the trigger. A party could argue that "forced" should be limited to this specific, direct mechanical push embodiment, and not, for example, a glancing blow or a camming action that merely assists a spring in resetting the trigger.

• The Term: "mechanically blocks"

• Context and Importance: This term, used in reference to the locking bar, defines the safety feature that prevents "hammer follow." The scope of "mechanically blocks" is critical to determining whether the accused device's safety mechanism infringes. The dispute may center on whether the accused device's mechanism functions as a "block" in the claimed sense.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The claim language itself is functional, suggesting that any component that mechanically prevents the trigger from moving could be considered a "block." The specification states the locking bar "blocks pivotal movement of the trigger 26" '223 Patent, col. 5:40-42
  • Evidence for a Narrower Interpretation: The specification describes a specific "locking bar pivotally mounted in a frame" that physically obstructs the trigger member's path '223 Patent, claim 4 An opponent could argue this term should be limited to a pivoting bar that creates a hard stop, as shown in the embodiments, and does not read on other types of safety interlocks.

VI. Other Allegations

• Indirect Infringement: The complaint alleges both induced and contributory infringement. Inducement is based on allegations that Defendants encourage, advertise, and instruct customers on how to use the infringing product Compl. ¶40 Compl. ¶54 Contributory infringement is based on the allegation that the Disruptor's components are "specially designed and adapted" for their infringing purpose and are "not suitable for substantial noninfringing use" Compl. ¶42 Compl. ¶56
• Willful Infringement: Willfulness is alleged based on both pre- and post-suit knowledge. The complaint alleges pre-suit knowledge by citing an "FRT Legal Library" on the manufacturer's website, which allegedly linked to the '223, '003, and '336 patents, thereby providing notice Compl. ¶31 Compl. ¶34 The complaint further alleges that infringement has been and continues to be willful, implying that infringement continues even after the filing of the lawsuit Compl. ¶38 Compl. ¶43

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

• A central issue will be one of technical specificity: can Plaintiffs prove that the accused "Disruptor" trigger operates with the exact sequence of mechanical interactions described in the asserted claims-particularly concerning how the trigger is "forced" to reset and how the safety selector "prevents" disconnector engagement-or will Defendants demonstrate a functional or operational difference sufficient to place the product outside the claims' literal scope?
• A key legal question will concern willfulness and knowledge: what is the evidentiary weight of a manufacturer's online "Legal Library" in establishing that a reseller, such as the Defendants, had the requisite knowledge of the patents and a high likelihood of infringement to support a finding of willfulness?
• Given the assertion of five patents from the same family with significant technological overlap, a procedural and substantive question will be one of claim scope differentiation: how will the parties and the court distinguish the scope of protection afforded by each successive patent, and can Plaintiffs establish that the accused product infringes the unique elements of each asserted claim, rather than merely the core technology common to all?