The 
Tokyo Marui (TM) P5K Short Magazine
 is a compact 28-round low-capacity magazine designed primarily for the MP5K (Kurz) series of airsoft electric guns (AEGs). It is a signature accessory for the smallest MP5 variant, intended to maintain the weapon's low profile. 
 
Product Overview
Capacity: 28 rounds (Low-Cap/Standard type).
Construction: Typically features a full metal outer shell for enhanced realism and durability.
Compatibility: Designed for the TM MP5 series of standard AEGs, including the MP5K, MP5K PDW, and High Cycle models.
Note: It is not compatible with the Tokyo Marui Next Generation Recoil Shock (NGRS) MP5 series, which uses a different proprietary magazine system.
Ideal Use: Highly favored for "survival games" or indoor CQB (Close Quarters Battle) due to its flush-fit design, which prevents the magazine from snagging on gear or terrain.