The benchmark short M4 mid-cap airsoft magazine receives a precision performance upgrade with the PTS EPM1-S RX. Maintaining the compact 20R profile preferred by players seeking a low-profile setups and prone stability, the EPM1-S RX delivers an impressive 170-round BB capacity without the rattle of high-cap magazines.
 
The primary upgrade in the EPM1-S RX lies in its completely re-engineered internal shell tooling. Identified by its distinct grey polymer colour and surface EPM1-S RX markings, the new internal housing features refined dimensional tolerances and a smoother internal BB channel. This design optimisation ensures reliable, consistent feeding across high rate-of-fire AEG setups, housed within the battle-tested DuPont™ Zytel® high-strength outer shell.
 
Key Features:
170-round BB capacity – exceptional for a short magazine format
Enhanced polymer construction – lightweight, durable, and field-proven
Proven EPM1 technology – same reliability PTS is known for
M4/AR-15 platform – works with Tokyo Marui, KWA, G&P, VFC, HK416, and most AEGs
Short 20R length – ideal for CQB and indoor skirmishes