I tried bending the rear of the factory mag out a little. It almost seem like the mag doesn't go up into the well far enough. I think i am bending it correctly, if it doesn't catch the base you need to bend the rear of the mag so the cartridge sits a little higher in the mag. On the replacement, when I push it up in the gun they pop out. I am not sure which way to tweak this one. If i hold the cartridges in and seat the mag when i close the bolt they keep popping out till the mag is empty. Any more advise advise would be greatly appreciated.