The TNP-2 is a precision-engineered micro-dart for the NDP-4 'Stutter' platform, combining a tungsten penetrator with an embedded neural disruption payload in a package small enough to be propelled by compressed CO2. Each dart consists of a 2mm tungsten needle with a hollow rear section containing a piezoelectric micro-array and a chemical neural disruptor capsule. On tissue penetration, the impact ruptures the capsule and the piezoelectric array activates, creating a localized electromagnetic pulse that synergizes with the chemical payload to produce the weapon's characteristic 'stuttering' effect — a 3-6 second period of complete motor and cognitive disruption.

The darts are packaged in nitrogen-sealed rotary cylinders of 6 rounds each, with each dart in its own sealed capsule to prevent cross-contamination of the chemical payload. The CO2 propulsion system uses a standard 12g cartridge that provides approximately 18 shots — three full cylinder loads — before replacement. The low propulsion energy means the dart relies on precision placement rather than brute penetration: it is designed to embed in soft tissue, not punch through armor. Operators aim for exposed skin, neck, face, and hands.

The neural disruption payload is the dart's most regulated component. The chemical compound — a proprietary Helix Biosystems formulation — interacts with standard neural interface hardware to amplify the disruption effect, meaning augmented targets experience more severe and longer-lasting symptoms than unaugmented individuals. This counterintuitive relationship between augmentation and vulnerability has made the TNP-2 a favored tool of operators who specifically target heavily augmented personnel.