Tested and compatible with MDT, AICS and Accurate-Mag AICS pattern 3.050 length metal magazines.
When used with MDT 10-round metal magazines, a longer spring/follower combination must be used (available separately on the MDT website), as the existing spring is not long enough to provide sufficient force on the follower when the extender is installed. This will work with all other known metal 10 round 308 AICS magazines. This extender will not work with any magazine that has any inserts like our 6BR magazine or a metal 223 mag with polymer inserts.