The LCT SA-M-7 600rds Magazine (Product Code: PK-188) is a high-capacity airsoft magazine designed for LCT's various LCK (AK series) AEGs. It features tough ABS plastic construction and a 600-round capacity. 
 
Product Details & Compatibility
Capacity: It holds 600 rounds of 6mm BBs, making it a high-capacity (Hi-Cap) magazine.
Material: The magazine is constructed from durable ABS plastic.
Winding Mechanism: It uses a thumb dial to wind the spring and feed the BBs, which helps avoid the noise associated with mid-cap magazines.
Color: This specific model comes in a black finish.
Compatibility: According to the manufacturer's information from LCT Airsoft, it is suitable for LCT's various LCK (AK) series of AEG rifles. It is not compatible with RPD, PKP, PP-19, PP-19-01, ZP19-01, AS VAL, VSS, SR3, SR-3M, TK-PDW-9MM, or ZK-PDW-9MM models.