If your looking for a 300rd hicap mag for an M4, I would highly recommend this mag. It's a very good mag for the money. It feeds well, is full metal, and has a spot for winding key if you don't want to use the wheel. Overall this is a great product I would highly recommend.
Winding key port
The winding wheel is hard to wind
Scratches easily but that is to be expected from airsoft
Hopper dooor can be hard to open sometimes
Rating: [5 of 5 Stars!]