Short Action Customs - Modular Headspace Comparator – Bullet Insert

***Requires Modular Headspace Comparator Body***

The Modular Headspace Body must be purchased separately and can be found at the Modular Headspace Comparator Body page.

Our unique bullet comparator uses a 3.0 degree “lead angle” to contact your bullet’s ogive in the exact same location as your barrel does, giving you the most accurate and useful measurements.

For example, our 6.5mm Bullet Insert starts at a .266″ diameter and angles down at 3.0 degrees to .256″ diameter, exactly like a 6.5mm chambered barrel would.