The insert is part of a new Modular Headspace Comparator system and requires a separately purchased Modular Headspace Comparator Body.
Made of 17-4 Stainless Steel, the insert offers durability and corrosion resistance for accurate cartridge headspace and bullet measurements.
Designed by SHORT ACTION CUSTOMS, LLC., it's compatible with cartridges up to 338 Lapua Magnum, specifically tailored for the 300 AAC Blackout cartridge.