The Modular Headspace Comparator Inserts are precision machined from 17-4 Stainless Steel for durability and corrosion resistance.
They are part of a new Modular Design that can accommodate cartridges up to 338 Lapua Magnum, aimed at providing the most accurate cartridge headspace and bullet measurements.
A separate purchase of the Modular Headspace Comparator Body is required for use with these inserts.