In 2010 the Magpul catalog featured a new 40 round version of the PMAG. It was to sell for $22.95. Sadly it never went on sale and does not appear in the Magpul 2011 catalog.

PMAG 40 Maglevel (in rifle) and PMAG 20
Another product that did not make it to market was the PMG 5|10|15. These were replaced with packs of round limiters that can be installed by the user.