I ordered two of these for my G&G SR-16 Carbine Sportline. Extremely durable, I accidentally dropped one onto a hard tile floor from chest height and there was barely a tiny scratch on the mag's floorplate. Very reliable, I have never lubed these mags and in several hundred rounds going through them so far, neither has had a single misfeed. I really like the long follower (the part that pushes the bbs and sticks out when the mag is empty), since it feeds every single bb, unlike most other mags that leave 3 or 4 bb's when they empty.
One other thing, these mags are VERY realistic, I compared them alongside a friend's real steel AR-15 mags and the dimensions and look, down to the etching on the floorplate was so close that when I first showed my friend the mag, he thought it was real until I showed him the plastic top! The only differences were the plastic top and the weight (fully loaded AR-15 mag weighed at least a half pound more than the G&G).
-Very Scratch resistant
-May not fit in some mag pouches
These will NOT fit in the old USGI 3 mag ALICE pouches you can find all over ebay (just a tad too long)
They do fit in my USGI ALICE LBV though so it mights just be an isolated incident.
I would recommend these mags to any airsoft player, especially those into MILSIM because of the realism and that you can choose to only load 30 rounds.
Rating: [5 of 5 Stars!]