The HVP-4 fires a magnetically stabilized tungsten-ceramic projectile wrapped in a rotating electromagnetic sheath that induces a tight helical spin at velocities exceeding 4,200 meters per second. Unlike conventional rifling, the spin is not imparted by barrel grooves but by a series of phased electromagnetic coils along the accelerator rail that fire in precise sequence, allowing the rotation rate to be tuned dynamically via a thumb-wheel adjuster on the receiver. At maximum spin, the projectile generates a secondary vacuum vortex behind its path capable of destabilizing soft tissue and lightweight armor panels through torsional shear stress alone.

What distinguishes the Corkscrew from conventional railguns is its Torsional Cavity Induction system — a secondary coil near the muzzle imparts a brief counter-rotating field to the projectile's outer ceramic sleeve just before exit. This causes the sleeve to fracture in a controlled spiral pattern mid-flight, releasing the denser tungsten penetrator core with an enhanced rotational wobble that defeats layered composite armor by exploiting the angular gaps between laminate sheets. The result is a weapon that transitions from a clean penetrator at close range to a tumbling, spiraling wound-maker at extended distances.

The HVP-4 is a long, ungainly rifle with a pronounced coil housing that runs the length of the barrel, giving it a corrugated, industrial appearance. It runs hot — sustained fire without the integrated coolant sleeve risks coil burnout — but in the hands of a trained operator it is regarded as one of the most mechanically elegant anti-materiel solutions available outside of military procurement channels.