I have about 5 of these mags and for the most part they work great. Just like anything they have a quirk or two after a while. 2 of my mags are refusing to accept BBs that are over .28g and the other 3 mag are happy with .25,.28 and .32g BBs. Not really a big deal as it's fairly cheap and easy to replace the springs inside the mags if it becomes a bigger issue. Other than that the mags have been great and I recommend them to any one wanting a good mid-cap for their aegs.