To help avoid some confusion, Wyatt's makes both a staggered feed and center feed extended box mag. I really do not care for the CF Wyatt's version. I do like a good detachable CF box mag and refuse to build a Lapua without one. My go to magazine is the Wyatt's staggered box mag for 338 Edge, Lapua feeeding from this setup is a pain. There will be a detachable CF box mag available in the fairly near future with an OAL of 3.900" this will be the hot ticket.