The Seekins Precision Havak SP Carbon Mag Magwell/Long Action Bottom Metal is the proprietary detachable bottom metal designed for the Havak PH1, PH2, PH3, and Element long-action platforms, accepting Seekins' hand-laid carbon fiber magazines with an extended 3.9-inch cartridge overall length capability. Featuring an oversized magwell for smooth, carefree magazine changes and an ambidextrous magazine release, this bottom metal is machined from high-strength aluminum and is not compatible with standard AICS-pattern magazines. Compatible long-action calibers include .300 Win Mag, .300 PRC, 7mm Rem Mag, 7mm PRC, and .338 Win Mag. Seekins Havak SP Carbon Mag Magwell/Long Action Bottom Metal 11700223F