For the money, you absolutely cannot beat these mags. They fit excellent in my AE/ICS MP5 with less mag wobble than the original HiCaps. When purchased individually, their G&P counterparts would cost 3 times what these do. Granted these are plastic, they seem to be built very well and are quite durable. They hold, on average, 96 rounds. Every mag I tried consistently did not fire the last 4 rounds left in the magazine which is to be expected from ANY magazine, including HiCaps so this is not a problem. I have had no feeding issues with any of them through multiple uses. In addition, these mags do come pre-oiled so it immediate maintenance is not needed. I've also used STAR LoCaps in the past and in terms of build quality I would highly recommend these over the STARS.
Please note, these mags fit fine in my AE/ICS MP5, but did not fit my friend's JG/Vector Arms MP5. The mags would literally fall out of the gun. He tried the electrical tape solution, which helped, but the mags didn't feed quite as well.
-Built well, very durable.
-Holds nearly the full 100 rounds.
-Fits very well into ICS metal-bodied MP5s.
-Did not seem to fit the JG/Vector Arms MP5.
-Plastic (although durable).
Overall I would HIGHLY recommend these magazines.
Rating: [5 of 5 Stars!]