The insert is part of the Modular Headspace Comparator system and requires the separate purchase of the Modular Headspace Comparator Body.
It is designed for cartridges up to 338 Lapua Magnum, with a new modular design for precise cartridge headspace and bullet measurements.
Constructed from 17-4 Stainless Steel for durability and corrosion resistance, it represents the highest quality in headspace and bullet measuring tools.