ABC IP LLC v. Para Bellum Research Lab LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: ABC IP, LLC (Delaware) and Rare Breed Triggers, Inc. (Texas)
  • Defendant: Para Bellum Research Lab LLC (Wisconsin) and James T. Radke (an individual)
  • Plaintiff's Counsel: Wood Herron & Evans LLP; Fish & Richardson P.C.
• Case Identification: 3:26-cv-00581, W.D. Wis., 06/23/2026
• Venue Allegations: Venue is alleged to be proper as Defendants reside in the district and have a regular and established place of business there.
• Core Dispute: Plaintiff alleges that Defendant's "Atrius Forced Reset Selector" infringes four patents related to firearm trigger mechanisms that enable an accelerated rate of fire.
• Technical Context: The technology involves "forced reset triggers," which use the energy from a firearm's cycling action to mechanically reset the trigger, allowing for a faster semi-automatic rate of fire compared to standard trigger mechanisms.
• Key Procedural History: The complaint does not reference any prior litigation, Inter Partes Review (IPR) proceedings, or licensing history between the parties.

Case Timeline

Date	Event
2021-11-05	Priority Date for '784 Patent
2022-01-10	Priority Date for '403 Patent
2022-09-08	Priority Date for '247 and '159 Patents
2024-07-09	'784 Patent Issued
2024-07-16	'247 Patent Issued
2025-08-28	Earliest Alleged Public Announcement of Accused Product
2026-03-17	'159 Patent Issued
2026-05-26	'403 Patent Issued
2026-06-23	Complaint Filed

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: Standard semi-automatic triggers limit the rate of fire because a user must manually release the trigger to allow it to reset before the next shot Compl. ¶¶18-19 The patent background notes that prior devices for increasing the rate of fire may require modifications to other parts of the firearm, such as the bolt carrier '247 Patent, col. 1:55-63
• The Patented Solution: The patent describes a self-contained "drop-in" trigger module with a three-position selector: safe, standard semi-automatic, and forced reset semi-automatic '247 Patent, abstract In the "forced reset" mode, the rearward movement of the firearm's bolt carrier during the firing cycle interacts with a cam within the module '247 Patent, col. 8:8-20 This cam then forces the trigger member back to its reset position, enabling the user to fire again immediately without having to manually release and reset the trigger Compl. ¶21 '247 Patent, col. 9:49-55
• Technical Importance: This design offers the functionality of an accelerated firing rate via a forced reset, while also preserving a standard semi-automatic mode, all within a single module that can be installed in common firearm platforms without modifying other components Compl. ¶21 '247 Patent, col. 2:17-29

Key Claims at a Glance

• The complaint asserts independent claim 15 Compl. ¶30
• The essential elements of claim 15 include:
  • A firearm trigger mechanism comprising a hammer, a trigger member, a disconnector, a cam, and a safety selector.
  • The safety selector is pivotable between safe, standard semi-automatic, and forced reset semi-automatic positions.
  • In the standard semi-automatic mode, the bolt carrier's movement causes the disconnector to catch the hammer, requiring the user to manually release the trigger to reset the mechanism for the next shot.
  • In the forced reset semi-automatic mode, the bolt carrier's movement causes a cam lobe to force the trigger to its set position, while the safety selector prevents the disconnector from catching the hammer, allowing the user to fire again without manually releasing the trigger.
• The complaint reserves the right to assert other claims Compl. ¶30

U.S. Patent No. 12,031,784 - "Adapted Forced Reset Trigger" (Issued: July 9, 2024)

The Invention Explained

• Problem Addressed: The geometry of forced reset triggers is often platform-specific. A trigger locking mechanism designed for an AR-15, for example, may not function in an AR-10 because dimensional differences in the bolt carrier could cause a failure to actuate the lock or, if lengthened, could cause interference with the bolt carrier's movement '784 Patent, col. 1:20-44
• The Patented Solution: The patent proposes a trigger locking device with a "deflectable extension" '784 Patent, abstract This extension is composed of a main body and a separate, upwardly extending portion that can pivot or fold relative to the body '784 Patent, col. 2:45-65 This allows the extension to be long enough to be actuated by the bolt carrier, but also to fold away to avoid interfering with the bolt carrier as it cycles to the rear Compl. ¶22 '784 Patent, Fig. 7
• Technical Importance: This design expands the compatibility of a single forced reset trigger design across different firearm platforms that have varying bolt carrier geometries, overcoming a key limitation of prior art devices Compl. ¶22

Key Claims at a Glance

• The complaint asserts independent claim 1 Compl. ¶44
• The essential elements of claim 1 include:
  • An extended trigger member locking device for a forced reset trigger mechanism.
  • A locking member movable between a first (locked) and second (unlocked) position.
  • The locking member has a body portion and an "upwardly extending deflectable portion that is separately movable relative to the body portion."
  • The deflectable portion moves between an "extended position and a deflected position."
• The complaint reserves the right to assert other claims Compl. ¶44

U.S. Patent No. 12,578,159 (Issued: March 17, 2026)

Technology Synopsis

• Similar to the '247 Patent, this patent describes a firearm trigger mechanism operable in a standard semi-automatic mode and a forced reset semi-automatic mode '159 Patent, abstract The mechanism uses a cam that interacts with the bolt means to force the trigger member toward its set position, thereby enabling an accelerated rate of fire Compl. ¶21

Asserted Claims

• Claim 1 is asserted Compl. ¶58

Accused Features

• The "Atrius Selector" is alleged to infringe by incorporating a mechanism that operates in both a standard semi-automatic mode and a forced reset semi-automatic mode, as claimed Compl. ¶¶60

U.S. Patent No. 12,636,403 (Issued: May 26, 2026)

Technology Synopsis

• This patent covers a forced reset trigger mechanism with a safety selector that is movable between a standard semi-automatic position and a forced reset semi-automatic position '403 Patent, abstract The position of the selector dictates how the trigger resets after firing, with the forced reset mode enabling a faster subsequent shot without manual trigger release Compl. ¶23

Asserted Claims

• Claim 38 is asserted Compl. ¶72

Accused Features

• The "Atrius Selector" is alleged to infringe by having a safety selector that allows a user to choose between a standard semi-automatic mode and a forced reset mode of operation Compl. ¶¶74

III. The Accused Instrumentality

Product Identification

• The accused product is the "(3-Position) 'Atrius Forced Reset Selector'" (the "Atrius Selector") Compl. ¶25

Functionality and Market Context

• The Atrius Selector is alleged to be a firearm component that allows a user to switch a firearm's operation between safe, standard semi-automatic, and forced reset semi-automatic modes Compl. ¶28 The complaint alleges it is marketed and sold as a standalone product, in conjunction with other parts, or pre-installed in a firearm, via social media websites Compl. ¶26 The complaint includes a screenshot from a social media post showing the accused device with the caption "THREE POSITION SELECTOR" Compl. p. 6 This visual evidence suggests the product is marketed based on its multiple selectable operational modes.

IV. Analysis of Infringement Allegations

The complaint provides detailed, color-coded renderings to illustrate its infringement theories. A rendering from the complaint shows the alleged interaction between the Atrius Selector (yellow), hammer (red), disconnector (orange), and trigger (brown) Compl. p. 10 These visuals form the primary basis for the infringement allegations.

'247 Patent Infringement Allegations

Claim Element (from Independent Claim 15)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a cam having a cam lobe and adapted to be movably mounted in the fire control mechanism pocket...said cam being movable between a first position...and a second position, in said second position said cam lobe forces said trigger member towards said set position,	The Atrius Selector includes a cam with a lobe that is movable between two positions. In the second position (forced reset mode), the cam lobe allegedly forces the trigger member toward its set position.	¶32	col. 8:5-13
whereupon in a standard semi-automatic mode, said cam is in said first position, rearward movement of the bolt carrier causes rearward pivoting of said hammer such that said disconnector hook catches said hammer hook,	In standard mode, the cam is in a first position. The rearward movement of the bolt carrier pivots the hammer, and the disconnector hook allegedly catches the hammer hook.	¶32	col. 8:50-col. 9:26
at which time a user must manually release said trigger member to free said hammer from said disconnector...so that the user can pull said trigger member to fire the firearm, and	In standard mode, the user must manually release the trigger to free the hammer from the disconnector, allowing the trigger to be pulled again.	¶32	col. 9:19-26
whereupon in a forced reset semi-automatic mode, said cam is in said second position, rearward movement of the bolt carrier causes rearward pivoting of said hammer such that said disconnector hook is prevented from catching said hammer hook,	In forced reset mode, the cam is in a second position. Rearward movement of the bolt carrier pivots the hammer, but the disconnector hook is allegedly prevented from catching the hammer hook. A plaintiff-generated rendering depicts this interaction Compl. p. 17	¶32	col. 9:27-41
thereafter the bolt carrier moves forward into battery, at which time the user can pull said trigger member to fire the firearm.	After the bolt carrier returns to battery, the user can pull the trigger again without having manually released it first.	¶32	col. 9:56-66

• Identified Points of Contention:
  • Technical Question: A central factual question will be whether the accused Atrius Selector, when in "forced reset" mode, actually causes the disconnector hook to be "prevented from catching said hammer hook," as required by the claim. The complaint's allegations rely on its own diagrams Compl. p. 17, and the actual mechanical operation of the accused device will be a key focus of discovery and expert testimony.
  • Scope Question: The claim recites a specific sequence of events for both "standard" and "forced reset" modes. The analysis may turn on whether the accused product's operational modes map precisely onto the claimed sequences, or if there are subtle but material differences in their mechanical function that could place the device outside the claim scope.

'784 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a locking member that is movable between a first position in which it locks a trigger member...and a second position where it does not restrict movement of the trigger member,	The Atrius Selector operates as a locking member, movable between a locked first position and an unlocked second position.	¶46	col. 2:53-58
said actuating contact causing the locking member to move from the first position to the second position,	Contact from the bolt carrier allegedly causes the locking member to move from the locked to the unlocked position.	¶46	col. 6:1-4
the locking member having a body portion that is movably supported and an upwardly extending deflectable portion that is separately movable relative to the body portion between an extended position and a deflected position.	The Atrius Selector allegedly has a body portion and an upwardly extending lever arm that is "separately movable" relative to the body. A plaintiff-generated diagram illustrates this separate movement by overlaying the lever arm in its extended and deflected positions Compl. p. 27	¶46	col. 6:4-9

• Identified Points of Contention:
  • Scope Question: The infringement analysis for the '784 patent will likely center on the claim term "separately movable." The dispute will question whether the alleged movement of the Atrius Selector's lever arm Compl. p. 26 qualifies as "separately movable" in the context of the patent, which teaches this feature as a solution for adapting a trigger to different firearm geometries like the AR-10 '784 Patent, col. 1:20-44
  • Technical Question: What is the nature and degree of the alleged "separate movement" in the accused device? The court will need to determine if the lever arm pivots or flexes independently of the main body in a manner consistent with the patent's teachings of a "one-way hinge feature" '784 Patent, col. 2:62-63, or if its movement is incidental and functionally distinct.

V. Key Claim Terms for Construction

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

• The Term: "preventing the disconnector hook from catching the hammer hook"
• Context and Importance: This phrase defines the key functional difference between the claimed "standard" and "forced reset" modes. Infringement requires proving that the accused product, when in its forced reset mode, actively prevents this engagement. The construction of "preventing" will be critical to determining if the accused device's operation meets this limitation.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: A party might argue that "preventing" should be given its plain and ordinary meaning, covering any mechanism that results in the disconnector failing to catch the hammer, regardless of the specific method. The abstract broadly states the safety selector prevents this action, without detailing how '247 Patent, abstract
  • Evidence for a Narrower Interpretation: The specification describes a specific embodiment where a "protuberance" on the safety selector physically contacts and blocks the disconnector from pivoting '247 Patent, col. 3:12-17 A party may argue that "preventing" should be limited to this disclosed mechanism of direct physical obstruction.

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

• The Term: "separately movable"
• Context and Importance: This term is the central inventive concept of the '784 patent, describing the relationship between the "deflectable portion" and the "body portion" of the locking member. The entire infringement allegation for this patent hinges on whether the accused product's lever arm is "separately movable." Practitioners may focus on this term because it distinguishes the invention from a unitary, rigid locking bar.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claim language does not specify the mechanism of movement, which could support a construction that covers any form of independent motion, including flexing, bending, or pivoting. The summary describes the invention as providing a "deflectable extension" that "deflects or folds" '784 Patent, col. 2:45-51
  • Evidence for a Narrower Interpretation: The detailed description and figures explicitly show an embodiment where the deflectable portion pivots on a transverse pin relative to the body '784 Patent, Fig. 2 '784 Patent, col. 3:40-47 A party could argue that "separately movable" should be construed to require a distinct, hinged or pivoted construction, as this is the only structure disclosed for achieving the separate movement.

VI. Other Allegations

• Indirect Infringement: For all asserted patents, the complaint alleges induced infringement based on Defendants' "advertising, promoting, and instructing others to use" the Atrius Selector Compl. ¶33 Compl. ¶47 Compl. ¶61 Compl. ¶75 It also alleges contributory infringement, stating that components of the Atrius Selector are "not suitable for substantial noninfringing use" because they are "specially designed" to implement the claimed forced reset functionality Compl. ¶35 Compl. ¶49 Compl. ¶63 Compl. ¶77
• Willful Infringement: Willfulness is alleged for all asserted patents. The complaint asserts that Defendants "have known or should have known" that their actions constituted infringement and continued to infringe despite an "objectively high likelihood" of infringement Compl. ¶36 Compl. ¶50 Compl. ¶64 Compl. ¶78 The allegations appear to cover both pre-suit and post-suit conduct.

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

The resolution of this case will likely depend on the court's findings on the following central questions:

• A core issue will be one of functional equivalence: Do the "standard" and "forced reset" modes of the accused Atrius Selector operate in the specific mechanical sequences required by the claims of the '247 and '159 patents? Specifically, does the accused device actively "prevent" the disconnector from engaging the hammer in its forced reset mode, or is there a material difference in its technical operation?

• Another central issue will be one of definitional scope: Can the term "separately movable," as used in the '784 patent to describe a hinged solution for accommodating different firearm geometries, be construed to read on the alleged flexing or movement of the accused product's lever arm? The case may turn on whether the accused product's design embodies the specific structural solution claimed in the patent.

• A key evidentiary question will be one of causation and intent: For the indirect infringement claims, the analysis will focus on whether Defendants' marketing materials and instructions actively encouraged customers to use the Atrius Selector in an infringing manner, and for the willfulness claims, what evidence exists of Defendants' knowledge of the asserted patents prior to the lawsuit.