PTS Syndicate finally unveil their EPM version for the Tokyo Marui New Generation M4 and SCAR-L AEGs that have the blowback and recoil feature. This can probably fit the Marui HK416 NEGs as well... "The PTS Enhanced Polymer Magazine, or EPM for short, is a new type of Polymer Magazine for airsoft rifles.  The EPM is a truly unique magazine, inside and out.