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Updated: Dec 12, 2025

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Development of a Novel Finger-Trigger Interface for Trigger Pull Measurement.

Emily E Fairbanks1, Jennifer Turner2, Junkun Ma3

  • 1Department of Forensic Science, College of Criminal Justice, Sam Houston State University, Huntsville, TX, 77340.

Journal of Forensic Sciences
|August 14, 2020
PubMed
Summary
This summary is machine-generated.

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A new finger-trigger interface device improves the accuracy of firearm trigger pull measurements. This innovation reduces variations from device positioning, enhancing forensic firearm examination reliability.

Area of Science:

  • Forensic Science
  • Mechanical Engineering
  • Instrumentation

Background:

  • Trigger pull measurement is crucial for firearm safety, function, and manufacturing evaluation in forensic analysis.
  • Existing methods face accuracy limitations due to device positioning, test procedures, and environmental factors.
  • Reducing measurement variability is essential for reliable forensic firearm examinations.

Purpose of the Study:

  • To develop an innovative finger-trigger interface device for accurate trigger pull measurements.
  • To minimize variations associated with the positioning of measurement devices on firearm triggers.
  • To enhance the precision and reliability of trigger pull data in forensic investigations.

Main Methods:

  • Evaluation of three force sensors based on different technologies for precision and linearity.
Keywords:
3D printed devicefinger-trigger interfacefirearms examinationforce sensortrigger pullunintentional discharge

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  • Design and 3D printing of sensor housing prototypes for finger-trigger interface devices.
  • In situ measurement of trigger pulls on selected firearms using the developed interface devices.
  • Comparison of collected data with results from a previously published study.

    • Main Results:

    • A miniature capacitive plate sensor demonstrated high precision and linear response for trigger pull measurements.
    • The developed finger-trigger interface devices showed acceptable accuracy and precision in preliminary tests.
    • The novel device design effectively reduced variations related to measurement device positioning.
    • Performance evaluation confirmed the device's potential for in situ trigger pull assessment.

    Conclusions:

    • The novel finger-trigger interface device offers a promising new method for in situ trigger pull measurement.
    • The device demonstrates acceptable accuracy and precision, addressing limitations of existing methods.
    • This innovation can enhance the reliability of forensic firearm examination data.
    • Further research and validation are warranted to fully establish its forensic application.