The Details:

• Dupont Zytel® polymer shell
• 170 round capacity
• Orange mag level indicator
• High-efficiency compression spring
• Perforated dot pattern 
• BB follower so you can use every last BB

The Specs:

• Color – Black & Dark Earth
• Material – Polymer
• Capacity – 170 airsoft BB rounds

Compatible with Tokyo Marui, KWA, G&G M4, VFC, including the HK416, PTS PDR-C, PTS ERG series, PTS Masada AEG, the AMOEBA AM Variants, and pretty much anything that takes an M4 mag

The PTS EPM1-S AEG magazine is a 20R length short M4 magazine that holds an impressive 170 bb rounds and offers the same reliability as the original EPM1, just well… shorter. A great mag if you go prone a lot.