Bought a pair of these for my G&P M4. They fit perfectly in the magwell. They don't wobble, but will drop to the ground upon hitting the mag release, making them perfect for high-speed reloads. Mags are nicely detailed, with G&G trades on the bottom and 5.56mm x 45 markings on the sides. They feed down to the last round with no hiccups or skips. Only potential problem is that the BB follower that actually pushes the rounds up the mag pokes out of an empty mag. It's a little small plastic part, that can easily break off and render the mag useless, so watch out. Mags are also a little longer than your average airsoft STANAG mags, could be a problem for realism freaks, not one for me.
*Feed very well
*Drop completely out of G&P magwells (great for hi-speed)
*BB follower can potentially break off
*longer than normal airsoft STANAG mag.
Rating: [5 of 5 Stars!]