I picked up a used Hahn's Bottom load mag well adapter off the EE and I was expecting it to have a retention system like a Spikes or Amm-Arms mag well adapters due to most online pictures showing it coming with an allen wrench and stating in the description.....

Adapter loads in from the bottom of the magazine well and secures with a tension device

http://stores.9mmar.com/hahn-precision-bottom-9mm-magwell-block/

After receiving the mag well adapter, all I see is a roller on the side (that just kind of flops around) but really see no way for it to place any tension on the magazine well of the receiver.

What am I missing? Help me understand what hold this style mag well block in place?

The roller is the tension device.

There is a small set screw on the inside front of the mag adapter that "wedges" the roller into the lower receiver.

Wow Can not believe I was over looking. I kept looking on the bottom block, at the same location as the Spikes.

n  m