Top Dead Center Locator

The PROFORM Top Dead Center Locator is an essential engine setup tool for gunsmiths, armorers, and precision shooters who require accurate piston positioning during firearm assembly and maintenance. This compact instrument allows technicians to identify true top dead center (TDC) on bolt carriers and receiver assemblies without disassembly guesswork. Whether you're building a custom rifle, performing maintenance on a duty weapon, or conducting detailed inspections, this locator eliminates margin-of-error and ensures repeatability—critical factors in professional firearm work.

Engineered for precision measurement, the Top Dead Center Locator works by establishing a reference point on bolt carrier geometry to confirm piston alignment without requiring full disassembly. Its compact dimensions (4.55 x 0.95 x 7.05 inches) and featherweight design (0.17 lbs) make it easy to carry in a kit bag or workspace. The tool's straightforward methodology provides consistent results across multiple firearms and platforms, reducing setup time while improving accuracy during component inspection, headspacing verification, and carrier group assembly sequencing.

This tool is indispensable for law enforcement armorers managing duty rifle fleets, military gunsmiths conducting field maintenance, and civilian precision builders focused on repeatability and reliability. The Top Dead Center Locator integrates seamlessly into any tactical workshop or gunsmithing setup, requiring no special equipment or installation. It's equally valuable during initial rifle build verification and routine maintenance cycles—anywhere accurate carrier positioning affects bolt timing, gas system tuning, or reliability diagnostics.