i got this for my echo1 M15 a4 (stag 15) because using the 10%off coupon it cost less than the gun its self. it was a tight fit and it did not click into place at first, but i did what the guy below me said (basically raise up the place where it hooks into the magasine catch) and it worked fine.
and if you want to modify it to have the faster winders, the hex key is bigger than most mags.
feeds very well
black, not grey
needs to be wound COMPLETELY or it will not feed the first shots right (wind after putting it in the gun)
only 300 rounds
Rating: [5 of 5 Stars!]