Not a major negative comment but I thought I'd share it. The initial issue I had with this is that the gas block has to be installed after the rail. So if you don't want the rail to be flapping around while installing the gas block, you have to tighten the collar screw to the upper then insert the gas block. Then, once the gas block is in position, you have to completely loosen the collar so you can turn the rail to allow an allen wrench to get to the gas block set screws to tighten it. The thing that bothered me the most is that after completing the install, the top picatinny rail is not leve...
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