Go for $17.95 new, used them twice. Sell them for both for $30 or trade for 3 GI Mags.
They fit my gun with bolt closed but not open. From what I've read it has to do with the casting of the magwell, some work and some require grinding. Mine requires grinding, and I really dont feel like grinding on a $1k gun. So I'll just get rid of them. I just thought they were cool. Supposedly the wear on the gun also affects it, more mags through the gun = more wear on the magwell = less tight.
They are brand-spanking new, nothing wrong with them.
If you want them and they dont work for you, i'll take them back and sell them at a gunshow.