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A major issue that I can see is the use of VFG's. If you eat shit getting in and out of a vehicle or walking on rocks, a VFG is often the spot that takes the impact, especially if you're walking uphill. You need the rail to be stronger than the VFG connection point so that the VFG is what breaks / comes off, not the rail. If the VFG clamping system and material of construction is more robust than the rail it is mounted on, you're going to have problems.
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I busted a polymer rail section on my MOE hand guards that was used for attaching a light. Aluminum is just as light and stronger so I'll be using that from now on.
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Until someone (anyone) actually comes up w one, we won't know what it really can do, or don't.
In theory though I am sure it has it's limitations, while it's advantages would be ease of manufacturing, and weight.