Things I liked:The magazine cycles good through the gun and is well made. Things I would have changed:Just like on my 300 magazines do away with the spring around the mag. I don't get it. Sumatra has the same type magazines without the spring so you would think ShinSung could do the same. They are brother companies afterall. This is why they get a 4 for value! What others should know:These are quality made but a bit overpriced wherever you try to get them. They should be $10 tops.