Not worth the money - ZEV Technologies Glock 17 9mm Luger +5 Round Pistol Magazine Extension

Disappointed to say the least. Well machined and looked great. The big flaw here is the locking tab that runs vertically in the back to hold the bottom plate. It is held in position by a rubber "nub" in the channel, but not enough upward pressure to secure this critical piece in place, resulted in the magazine spring and base plate dumped out upon slide lock. I held back my review until now to give it more time at the range but it happened a few times now. An easy fix with a little bit of blue RTV to keep it in place, but for $40 each, users shouldn't have to do this.