Barrel Nut Alignment Shim – Precision Indexing Tool Designed to index standard barrel nuts and ensure perfect alignment during installation. Installs between the barrel extension and the barrel nut to improve fit and alignment consistency.
Compatibility: Compatible with standard barrel nuts for .223/5.56 /7.62x39/ 6.8 / .300 BLK platforms. Not compatible with .308 Win or 6.5 Creedmoor barrels or barrel nuts.