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 precision measurement of cartridge headspace and bullet length, accommodating cartridges up to .338 Lapua Magnum.
Constructed from 17-4 Stainless Steel for durability and corrosion resistance, it represents the highest quality in headspace and bullet measuring tools.