FSE-003 468 Replacement 468 mag well
Round Collar Magazine Version: This version will only work with the multi-piece upper and will require this standard feed adapter to work
DMAG/Helix Magazine Version Gen1: This version does not have the integrated magazine activator. Use this injunction with 468-059 Air Chamber Valve Cover For DMAG (Tooth Version)
DMAG/Helix Magazine Version Gen2: This version has the integrated magazine activator. Use this injunction with 468-08 Air Chamber Valve Cover For DMAG