ABC IP LLC v. Para Bellum Research Lab LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: ABC IP, LLC (Delaware); Rare Breed Triggers, Inc. (Texas)
  • Defendant: Para Bellum Research Lab LLC (Wisconsin); James T. Radke (Wisconsin)
  • 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: Plaintiffs allege that Defendants' "Atrius Forced Reset Selector" for firearms infringes four patents related to forced reset trigger mechanisms.
• Technical Context: The technology concerns firearm trigger mechanisms designed to increase the rate of semiautomatic fire by using the energy from the weapon's cycling action to mechanically reset the trigger.
• Key Procedural History: The complaint does not mention any prior litigation, Inter Partes Review (IPR) proceedings, or licensing history related to the asserted patents.

Case Timeline

Date	Event
2021-11-05	Priority Date for U.S. Patent No. 12,031,784
2022-01-10	Priority Date for U.S. Patent No. 12,636,403
2022-09-08	Priority Date for U.S. Patent Nos. 12,038,247 and 12,578,159
2024-07-09	U.S. Patent No. 12,031,784 Issues
2024-07-16	U.S. Patent No. 12,038,247 Issues
2025-08-28	Accused Product marketing begins
2026-03-17	U.S. Patent No. 12,578,159 Issues
2026-05-26	U.S. Patent No. 12,636,403 Issues
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: The patent background describes a desire among firearm users to increase the rate of semiautomatic fire beyond what is typically possible with a standard trigger mechanism, which requires a full release and reset of the trigger between shots. The patent notes that while prior art forced reset triggers exist, "Further improvement... is desired" '247 Patent, col. 2:15
• The Patented Solution: The patent discloses a "drop-in" trigger module featuring a three-position safety selector that allows the user to choose between "safe," "standard semi-automatic," and "forced reset semi-automatic" modes '247 Patent, abstract The core of the mechanism is a pivoting cam that is actuated by the rearward movement of the firearm's bolt carrier. In forced reset mode, the cam forces the trigger member back to its set position, while the safety selector simultaneously prevents the disconnector from catching the hammer. This allows the user to fire another round immediately upon the action returning to battery, without needing to manually release the trigger '247 Patent, col. 2:55-4:10
• Technical Importance: The invention provides a selectable, multi-mode firing capability in a self-contained module, designed to be easily retrofitted into common firearm platforms like AR-pattern rifles '247 Patent, col. 2:18-2:28

Key Claims at a Glance

• The complaint asserts independent claim 15 and reserves the right to assert others Compl. ¶30
• Independent Claim 15 requires:
  • A firearm trigger mechanism comprising a hammer, trigger member, disconnector, and a cam.
  • The cam is movable between a first position (for standard semi-automatic mode) and a second position (for forced reset mode), where in the second position, a cam lobe forces the trigger member toward its set position.
  • In standard mode, the rearward movement of the bolt carrier causes the disconnector to catch the hammer, requiring a user to manually release the trigger to fire again.
  • In forced reset mode, the rearward movement of the bolt carrier causes the disconnector to be prevented from catching the hammer, allowing a user to fire again without manually releasing the trigger.

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

The Invention Explained

• Problem Addressed: The patent's background section explains that forced reset trigger designs intended for AR-15-pattern firearms are often incompatible with AR-10-pattern firearms due to different bolt carrier geometries. Specifically, a locking bar long enough to be actuated by an AR-10's bolt carrier would interfere with the carrier's movement as it cycles to the rear '784 Patent, col. 1:20-1:44
• The Patented Solution: The patent describes a trigger locking device that incorporates a "deflectable extension" with a "one-way hinge feature" '784 Patent, col. 2:45-2:51 This extension is long enough to be properly actuated by the bolt carrier upon its return to battery, but it is designed to fold or deflect out of the way to allow the bolt carrier to pass without interference during its rearward travel '784 Patent, col. 3:45-3:51 This allows a forced reset mechanism to be adapted for firearms with different internal dimensions.
• Technical Importance: The invention aims to expand the applicability of forced reset trigger technology to a wider variety of semiautomatic firearm platforms beyond the standard AR-15 '784 Patent, col. 1:5-1:11

Key Claims at a Glance

• The complaint asserts independent claim 1 and reserves the right to assert others Compl. ¶44
• Independent Claim 1 requires:
  • An extended trigger member locking device for a forced rest trigger mechanism.
  • The device includes a locking member movable between a first (locking) and second (non-restricting) position.
  • The locking member has a body portion and an "upwardly extending deflectable portion that is separately movable relative to the body portion between an extended position and a deflected position."

Multi-Patent Capsule: U.S. Patent No. 12,578,159 - "Firearm Trigger Mechanism", Issued March 17, 2026

• Technology Synopsis: The '159 Patent describes a firearm trigger mechanism operable in both a standard semi-automatic mode and a forced reset semi-automatic mode to increase the rate of fire '159 Patent, abstract It uses a cam, actuated by the firearm's bolt, to force the trigger toward its reset position. The key distinction between modes is that in the standard mode, the disconnector catches the hammer, requiring a manual trigger release, while in the forced reset mode, the disconnector is prevented from holding the hammer, allowing for immediate subsequent firing '159 Patent, col. 1:16-1:59
• Asserted Claims: The complaint asserts independent claim 1 Compl. ¶58
• Accused Features: The Atrius Selector is alleged to be part of a trigger mechanism that is operable in both a standard and a forced reset semi-automatic mode, using a cam to force the trigger to reset, thereby infringing the patent Compl. ¶60

Multi-Patent Capsule: U.S. Patent No. 12,636,403 - "Firearm Trigger Mechanism", Issued May 26, 2026

• Technology Synopsis: The '403 Patent discloses a trigger mechanism with a three-position safety selector (safe, standard semi-automatic, forced reset) and a locking member '403 Patent, abstract The patent addresses the problem of enabling a higher rate of semiautomatic fire by providing a selectable forced reset function. In the forced reset mode, the cycling of the firearm forces the trigger to reset, and the safety selector prevents the disconnector from catching the hammer, allowing the user to fire again without a manual trigger release '403 Patent, col. 2:8-2:17
• Asserted Claims: The complaint asserts independent claim 38 Compl. ¶72
• Accused Features: The Atrius Selector is alleged to be a forced reset trigger mechanism with a safety selector movable between a standard semi-automatic position and a forced reset position, thereby infringing the patent 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 complaint alleges the Atrius Selector is a component for firearms that enables multiple modes of operation, including a standard "disconnector mode" and a "forced reset semiautomatic with cam" mode Compl. ¶28 It is allegedly sold as a standalone product, in conjunction with other trigger parts, or pre-installed in complete firearms Compl. ¶26 A marketing image included in the complaint advertises the product as a "THREE POSITION SELECTOR" Compl. ¶27, p. 7 Another image shows a product listing for the "Atrius Forced Reset Selector" Compl. ¶27, p. 7

IV. Analysis of Infringement Allegations

'247 Patent Infringement Allegations

The complaint provides plaintiff-generated renderings, such as the diagram of the trigger mechanism with parts color-coded, to illustrate the alleged operation of the Atrius Selector in both standard and forced reset modes Compl. ¶32, p. 10

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,	The Atrius Selector functions as a cam with a lobe and lever that is movably mounted in the fire control mechanism pocket.	¶32	col. 8:7-10
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 cam is movable between first and second positions. In the second position, the cam lobe forces the trigger member toward the set position when the cam is in forced reset mode.	¶32	col. 8:36-44
whereupon in a standard semi-automatic mode... rearward movement of the bolt carrier causes rearward pivoting of said hammer such that said disconnector hook catches said hammer hook...	In standard semi-automatic mode, the rearward movement of the bolt carrier causes the disconnector hook to catch the hammer hook. A user must then release the trigger to fire again.	¶32	col. 9:1-9
whereupon in a forced reset semi-automatic mode... 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 semi-automatic mode, the disconnector hook is prevented from catching the hammer hook, allowing the user to fire again without first releasing the trigger.	¶32	col. 9:27-37

• Identified Points of Contention:
  • Scope Question: A central question may be whether the accused Atrius Selector, which appears to be a single integrated component, can be considered the claimed "cam". The defense could argue that the claims require a "cam" and a "safety selector" as distinct components, whereas the accused product combines these functions.
  • Technical Question: The infringement theory relies on the allegation that in forced reset mode, the accused product "prevent[s]" the disconnector hook from catching the hammer. An evidentiary question for the court will be whether the physical operation of the Atrius Selector achieves this function in the specific manner required by the claims and depicted in Plaintiffs' renderings Compl. ¶32, p. 17

'784 Patent Infringement Allegations

The complaint includes plaintiff-generated renderings that show a cross-section of the alleged "deflectable portion" of the Atrius Selector, illustrating its separate movement relative to the main body Compl. ¶46, p. 27

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 against pulling movement and a second position where it does not restrict movement...	The Atrius Selector operates as a locking member and is movable between a locked first position and an unlocked second position.	¶46	col. 2:56-3:2
the locking member having a body portion that is movably supported...	The Atrius Selector has a body portion that is movably supported by the lower receiver.	¶46	col. 3:3-3:9
...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 has an "upwardly extending deflectable portion (lever arm)" that is designed to allow separate movement relative to the body portion between an extended and a deflected position.	¶46	col. 3:39-3:51

• Identified Points of Contention:
  • Technical Question: The core of this infringement allegation will turn on whether the accused product's "upward extending... (lever arm)" is, in fact, "separately movable relative to the body portion." The complaint's diagrams suggest a hinged or pivoting connection Compl. ¶46, p. 26 The actual construction and operation of the accused device will be a critical factual issue for the court.
  • Scope Question: The dispute may focus on the construction of the term "deflectable portion". The defense might argue for a narrow definition requiring a specific type of hinged or flexible structure taught in the patent's embodiments, while Plaintiffs may argue for a broader meaning that covers any component that yields to allow the bolt carrier to pass.

V. Key Claim Terms for Construction

For the '247 Patent:

• The Term: "cam"
• Context and Importance: The infringement allegation for the '247 Patent, as well as the '159 and '403 patents, depends on the Atrius Selector being construed as or containing the claimed "cam". Practitioners may focus on this term because the defense could argue the accused product is only a "selector" and does not perform the claimed camming function, or that the claims require the "cam" and "safety selector" to be separate parts.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification describes the function of the "cam" as having a "lobe" that "interacts with the cam follower" to "pivot the trigger member" '247 Patent, col. 8:7-10 '247 Patent, col. 9:19-22 This functional language may support an interpretation where any component performing this action is a "cam".
  • Evidence for a Narrower Interpretation: The patent figures depict "cam 72" and "safety selector 110" as structurally distinct components with separate reference numbers, suggesting they are not the same part '247 Patent, FIG. 3 This could support an interpretation that the "cam" must be a separate component from the selector.

For the '784 Patent:

• The Term: "upwardly extending deflectable portion that is separately movable"
• Context and Importance: This term captures the point of novelty of the '784 Patent, which was designed to adapt a forced reset mechanism for different firearm platforms. Infringement hinges on whether the accused selector's "lever arm" meets this definition.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The patent summary states the invention provides a "deflectable extension" with a "one-way folding capability," and the specification notes the extension may "deflect or fold" '784 Patent, abstract '784 Patent, col. 2:50 This language could support a broad construction covering any mechanism that yields in one direction.
  • Evidence for a Narrower Interpretation: The patent's primary embodiment shows a distinct "foldable extension portion 22" that pivots on a "transverse pivot pin 24" relative to the "locking bar body 26" '784 Patent, col. 3:39-3:42 '784 Patent, FIG. 2 This may support a narrower construction requiring a physically distinct, hinged component, which aligns with the claim language "separately movable."

VI. Other Allegations

• Indirect Infringement: For all four asserted patents, the complaint alleges induced infringement based on Defendants' "advertising, promoting, and instructing others to use and/or how to use the Atrius Selector" Compl. ¶33 Compl. ¶47 Compl. ¶61 Compl. ¶75 Contributory infringement is also alleged, on the basis that the components of the Atrius Selector are "specially designed" for infringement and are "not suitable for substantial noninfringing use" Compl. ¶35 Compl. ¶49 Compl. ¶63 Compl. ¶77
• Willful Infringement: The complaint alleges willful infringement for all patents, asserting that Defendants "have known or should have known" their actions constituted infringement and that they "could not reasonably or subjectively believe that the patent is invalid" Compl. ¶36 Compl. ¶50 Compl. ¶64 Compl. ¶78

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

• A central issue will be one of structural and functional correspondence: Does the accused Atrius Selector, which is presented as a single integrated component, perform the functions of the separately claimed "cam" and "safety selector" in the '247, '159, and '403 patents? This will require the court to determine if a single part can satisfy multiple claim limitations and whether its real-world operation matches the complex functions described in the claims.
• A key evidentiary and claim construction question for the '784 patent will be one of definitional scope: Can the term "deflectable portion that is separately movable," which is taught in the context of a hinged part for adapting a trigger to an AR-10 platform, be construed to cover the "lever arm" structure of the accused Atrius Selector? The outcome will likely depend on a detailed factual analysis of the accused product's design and a legal interpretation of the claim's structural requirements.