This item was originally made as a lid for Box mags that can be used to fill the mag up more quickly.
Being 3D printed, the lid is made of Highly durable (PLA) plastic, with only metal/steel parts being a set of M3 screws and nuts.
Compatibility: It was designed to fit airsoft box mags.
NOTE* you would need to cut out a small space that would be covered with this lid. so it can be used for its purpose.
Dimensions: Height- 0,7 cm, Width-4,5 cm, Lenght-4,5 cm