Only read up to some one using a hammer and punch. This person was not thinking when they did this (no offense, but read on).
The accuwedge is a piece of rubber that eats up the play between the upper and lower. you have to pull down the upper, push the pin through, and now there is no play because the upper is being forced against the hold pin by the accuwedge (removing all play). This is not terrible for the pin, and you can humor yourself by buying a replacement, or a titanium or steel one, whatever floats your boat, it isn't pushing insanely hard.
However, let's say it is time to remove the upper. You cannot just use a .223 round push the pin... wth you think? It's really stuck. Said person said [i]fine, I'll fix you g00d[/i] and took a hammer and punch, and [b]pop[/b], out it came... they were not happy. Before I did that, I tried to think what was happening. I knew it was never [i]that[/i] hard to get out... I then used my left hand to squeeze the upper towards the lower (depressing the accuwedge), and then using my .223 like normal to push the pin, a little stiff, but do-able in the field, for sure.
Just the way I do it... I used an accuwedge even though my bushy had no play between upper and lower. I've changed upper ssince then, and didn't even try without the wedge.