The 37 XC Modular Headspace Comparator Insert requires a separately purchased Modular Headspace Comparator Body.
It is a new version designed for accurate cartridge headspace and bullet measurements, compatible with cartridges up to 338 Lapua Magnum.
Made from 17-4 Stainless Steel, these inserts offer increased durability and corrosion resistance, representing the highest quality in headspace and bullet measuring tools.