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This adapter does exactly what it is supposed to do and fills out the grip area when yo insert a longer G21 mag into a G30 mag well. However, the base plate design has been changed and the Gen 5 G21 magazine that I bought with it does not fit together as it is supposed to do. Luckily, I had a Gen 4 mag in the extras box. I swapped the two out and it fit properly. I'll need to check that Gen 5 magazine for compatibility with the Gen 2 G21 that I have.
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