"Did not even make it one game .
Any twisting motion on the gun and the grip disconnects from the rail clip.
Item looks great and my battery fits perfectly .
I love getting the battery out of the forward guard and into the grip ,it make charging and battery swaps a lot easier.
But in game play you may use the vertical grip to twist or rotate the gun. Don't ! It will just pop out of the rail clip and can not be reattached with out leaving the game.
I even used a wrench to tighten up the one nut/bolt that holds it to the gun. But that did not help . It just pop'ed off the next round.
I will be looking for another replacement vertical grip battery box.
And NO I do not want a Peq box."