The 
LCT LCK74 450rds Magazine (BK)
 (product code PK-111) is a high-capacity airsoft magazine designed for LCT and other compatible AK series AEGs. It holds 450 6mm plastic BBs and is primarily made of polymer. 
 
Product Specifications
Capacity: 450 rounds
Color: Black
Material: Primarily ABS/POM/Steel (Polymer)
Compatibility: Designed for LCT's various LCK designs and other compatible AK series AEGs, excluding models like the RPD, PKP, AS VAL, etc.
Type: Hi-Cap (High Capacity) magazine
Model Number: PK-111