Umarex HK416 D Hicap 400bb charger.

The Umarex Hi Cap airsoft magazine is designed for the Heckler & Koch HK416 D 0.5J platform. This airsoft magazine has a capacity of 400 6mm BBs. The spring in the airsoft magazine is capable of feeding the majority of BBs without needing to be wound up. It is constructed from plastic with a plastic interior mechanism. This magazine is not compatible with most standard TM M4/M16 AEG platforms or similar.

Operation

Open the top cover and pour BBs into the opening. Close the cover and prime the internal spring using the bottom wheel. To ensure proper function, it is recommended not to fully prime this spring. BBs can be stored inside the airsoft magazine without tensioning the spring. To release the tension on the spring, point the magazine's opening towards a BB recovery space and press the button near the BB exit point.

Caution! Do not pour silicone oil inside. This lubrication method is incorrect and may affect the accuracy of the BBs, potentially causing silicone oil to dirty the HopUp rubber.