From PTS Syndicate we have their Enhanced Polymer Magazine in Dark Earth.
The EPM is a mid-capacity stanag style polymer magazine for airsoft M4/M16 AEG's. Constructed from Dupont Zytel Polymer, this magazine is remarkably rugged with a solid weight. The recessed panels allow for a better grip and the unique mag well guides help reduce the possibility of snagging when being drawn or reinserted into pouches. The bullet window features realistic looking dummy 5.56 rounds and even has a visual indicator at the bottom of the clear window to show the magazine is full (orange follower will be visible when fully loaded).The base of the magazine features a rubber foot to allow the operator to use the magazine itself as a makeshift mono pod for improved stability when trying to make an accurate shot.