^^^^^^^ How in the world did you get them apart?
I talked to DPMS and they said to just return them for replacement.
I can't see how they come apart without using a bunch of force to get the base tab moved over.
It looks like you would have to deform the tab to get it to the point you could remove it.
I can tell that any screw driver that I have will get bent trying to bend the tab up.
What did you use to do that?