This is an awesome mag! It fits my GR-16A3 like a dream. It does wobble a bit, but nothing that electric tape can't fix. This things holds an insanse amount of rounds, and you don't have to wind or here the noise off bbs when you run! (I hate Hi-Caps). There were a couple dings along the back of mine when I recieved, butit doesn't matter it works fine! Feeds about 155 of 160, because the last 5 aren't pushed all the way into the chamber, and just drop out when mag is released. Comes in its nice own box to!
160 Rounds! Wow!
Metal, I think it's steel.
Sleek grey look makes an M16 look great.
Spring comes working well, no need to lube or anything!
Little dings on magazine, but nothing major.
Rating: [5 of 5 Stars!]