The insert is part of the Modular Headspace Comparator system and requires the separate purchase of the Modular Headspace Comparator Body.
It is a new, improved design made from 17-4 Stainless Steel for enhanced durability and corrosion resistance, suitable for cartridges up to 338 Lapua Magnum.
Manufactured by SHORT ACTION CUSTOMS, LLC., this insert ensures the most accurate cartridge headspace and bullet measurements.