The Seekins Precision Havak Long Action AICS-CIP M3 PH/Element Magwell/Bottom Metal is a caliber-specific long-action magazine well insert designed for the Havak PH3 and Element M3 platforms, enabling them to accept standard AICS-CIP pattern long-action magazines. Machined from high-strength aluminum and finished in matte black, the insert drops in via simple takedown pins without tools, maintaining zero-repeatability and system integrity across caliber configurations. Compatible long-action cartridges include .300 Win Mag, .300 PRC, 7mm PRC, and similar long-action AICS-CIP headspace dimensions. Seekins Havak Long Action AICS-CIP M3 PH/Element Magwell/Bottom Metal 11700453F