PTS Syndicate shared this video of Mike of Airsoft GI testing the PTS EPM Magazine for the Tokyo Marui M4 Blowback and Recoil AEG. The EPM is a midcal designed for use M4 AEGS. Made of DuPont Zytel Polymer, it is extremely durable and robust with a great finish. Better check first with your retailer so you can purchase the correct version for your M4 AEG.