This is GREAT for the price unless you plan on using it with SmallRig cages with built in nato front and back rails . The included 7cm nato rail requires LESS pressure on the locking button as it is slightly thinner than the built in rail (I'm talking millimeters here) found in SmallRig cages. This means you have to adjust the pressure by disassembling the block. It DOESN'T matter if you don't plan to use the supplied guide along with the SmallRig cage as you only need to set the correct blocking pressure once. I buy more of these to use outside of the cage and just buy a few more rails from this brand to mount. Works solid.
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