Here is the new detachable box mag assembly from Seekins Enterprises. It is very stout, the bottom metal CNC machined from alluminum stock and the magazines CNC formed from a thick spring tough sheet metal. The magazine assembly itself is the toughest magazine I have ever seen. The bottom metal has as close fitting beveled mag well and a cross bolt styled release. The release allows one hand operation and the mags fall free no more, thumbing the lever and prying loose or having to hook a front pin and rotate lock up, simply push the release to drop the mag and shove it straight in to seat. The pic you see is a 338 Edge with a 4 shot single stack mag They feed very nicely from the center feed mag and can run an oal of 3.890". Kudos to Glenn for getting this project off the ground and producing a well though out piece of equipment. These should be available in a few weeks.