9mm mag block [Archive] - Glock Talk

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RWBlue
01-31-2010, 22:25
What is the difference in the following?

http://www.brownells.com/.aspx/sid=5849/pid=1548/sku/Bottom_Loading_9mm_Conversion_Block

http://www.brownells.com/.aspx/sid=41561/pid=1548/sku/Top_Loading_9mm_Conversion_Block

http://www.brownells.com/.aspx/pid=19669/Product/AR_15_M16_9mm_MAG_BLOCK_ADAPTER

And the Rock River mag blocks.

I would like something I can swap out at the range, is reliable...if possible.